Two years ago, we had a story, a rough manuscript, and no idea how to turn it into a real book. We are Sparkle Tree Press, a small independent publisher based in the UK. Our main series follows Poppy the Dragon, a character our youngest team member dreamed up during a rainy afternoon in Wales. We've gone from a single rough draft to a growing series sold on Amazon UK.
The children's book market in 2026
The global children's book market is worth $10.15 billion in 2026, and analysts at Market Reports World expect it to reach $13.29 billion by 2035, growing at roughly 3% a year. Picture books alone account for $12.7 billion this year, with projections of $22.1 billion by 2033 at a 4.34% compound annual growth rate.
Those numbers matter because they tell you there is real demand. Parents still buy physical books for their children. Libraries still stock them. Schools still run reading programmes. The market is not shrinking; it is expanding, and self-published authors are taking a bigger slice of it.
Why we chose KDP
We looked at several routes: traditional querying, hybrid publishers, IngramSpark, and Amazon's Kindle Direct Publishing (KDP). For a first series with no existing audience, KDP made sense.
Zero upfront cost. Amazon takes a cut of each sale (35% or 60% depending on format and pricing), but you pay nothing to list. Print on demand means we do not store boxes of books. When someone orders a Poppy the Dragon paperback on Amazon UK, Amazon prints it, ships it, and handles customer service.
The KDP process, step by step
Writing and editing
Our first manuscript for Poppy the Dragon was about 800 words. Picture books for the 3-7 age range typically run 500 to 1,000 words, and every single word has to earn its place. We wrote three drafts ourselves, then hired a freelance children's book editor through Reedsy. She charged around 400 pounds for a developmental and line edit. That was money well spent.
Interior layout
Children's picture books need specific trim sizes. We went with 8.5 x 8.5 inches, which is a common choice for picture books and prints well through KDP's print-on-demand service. We laid out the interior in Adobe InDesign, placing one spread per PDF spread. KDP requires a print-ready PDF with embedded fonts and 300 DPI images.
KDP gives you a free ISBN, but it lists the publisher as "Independently Published." We bought our own from Nielsen (89 pounds for one, 164 for ten), which means we are listed as the publisher.
Upload and proof
Uploading to KDP is straightforward: upload your interior PDF, your cover PDF, fill in your metadata, set your price, and request a proof copy. We ordered physical proofs for every title because colours on screen never quite match printed output.
The illustration decision: AI versus hand-drawn
This is the question we get asked most often, and we want to be honest about it.
For the first Poppy the Dragon book, we hired a freelance illustrator. She charged 1,200 pounds for 12 full-colour illustrations. The art was beautiful, full of personality, and exactly what we wanted. It also took four months from commission to final files.
For subsequent titles, we explored AI-assisted illustration tools. According to recent industry surveys, 61% of publishing firms now use AI in some capacity.
Our approach has been hybrid. We use AI tools for early concept work and rough compositions, then commission a human illustrator for the final art. This cuts the concept phase from weeks to days and has brought our illustration costs down by about 40% without sacrificing the hand-crafted feel.
If you are working with a tighter budget, there are talented illustrators on platforms like Fiverr and Reedsy who offer picture book packages from 500 to 800 pounds.
Cover design
For children's books, the cover does most of the selling. We spent 350 pounds on our first cover through a specialist children's book designer, then used the same designer for subsequent titles to keep a consistent series look. The cover needs to work at thumbnail size.
Marketing on Amazon UK
Keywords and categories
When you upload to KDP, you choose two categories and up to seven keywords. Do not pick broad categories like "Children's Books." Instead, go narrow: "Children's Dragon Books" or "Picture Books About Friendship Ages 3-7." We used Publisher Rocket (about 90 pounds) to research keywords.
Amazon Ads
We started running Amazon Sponsored Products ads about two months after our first book launched. Our daily budget began at 5 pounds. Our early results were rough — we spent about 150 pounds in the first month and made around 80 pounds in sales. But the data was valuable.
By month three, we had narrowed our keyword list and our ads were profitable. We now spend about 300 pounds per month on Amazon UK ads and generate roughly 900 pounds in monthly sales across the series.
Reviews
Reviews are the oxygen of Amazon sales. We asked friends and family to buy and review the first book honestly. We also signed up for NetGalley. Within three months, we had 25 reviews on our first title with a 4.6 average.
Building a readership beyond Amazon
Our email list has about 1,200 subscribers, mostly parents and teachers who found us through social media or the website. One email a month: a behind-the-scenes look at how we make the books, a printable activity sheet, and the occasional discount code. Open rate sits around 42%.
We also partner with primary schools. Free virtual author visits where we read the book over video call and do a drawing activity with the class.
What we would do differently
First, we would have built the email list before publishing, not after. Even a simple landing page with a free colouring sheet download would have given us a launch-day audience.
Second, we would have ordered more proof copies. We caught a colour issue on our second book that would have been obvious in a physical proof but was invisible on screen.
Third, we would have started Amazon Ads earlier. We waited two months because we wanted "organic" sales first. That was two months of lost data.
How Sparkle Tree Press can help
We built Sparkle Tree Press because we believe more independent voices should be in children's publishing. Self-publishing is not a consolation prize. It is a genuine route to reaching readers.
Have a look at our Poppy the Dragon series to see what a self-published children's series looks like in practice. Read more about us at sparkletreepress.com. We also share resources and behind-the-scenes content on our news page.
Frequently asked questions
How much does it cost to self-publish a children's picture book in the UK?
Based on our experience, expect to spend between 1,500 and 3,000 pounds for a professional-quality picture book. That covers editing (300-500 pounds), illustration (500-1,500 pounds), cover design (200-400 pounds), and an ISBN (89 pounds from Nielsen). KDP itself is free to use.
Is KDP the best platform for self-publishing children's books in the UK?
For most first-time children's book authors, yes. KDP's print-on-demand model means zero upfront printing costs, and Amazon.co.uk is where most UK parents shop. The downside is Amazon's cut (up to 60% on print sales) and the exclusivity requirement if you enrol in KDP Select.
Can I use AI illustrations in a children's book?
Technically yes, but there are important considerations. Amazon requires you to disclose AI-generated content when you upload. Our recommendation is to use AI as part of the process rather than as the final product. Use it for concepts and compositions, but have a human illustrator create the final art.
How long does the whole process take?
From finished manuscript to book on Amazon, allow 3 to 6 months. The illustration phase takes the longest, especially if you are working with a freelancer who has other commissions. Editing takes 2 to 4 weeks. Layout and cover design take another 2 to 3 weeks.
What age range sells best for self-published children's books?
Picture books for ages 3 to 7 are the sweet spot. They are short enough for a first-time author to manage, the illustration quality expected is high but achievable with a good freelancer, and parents of this age group buy the most books.
Sparkle Tree Press is an independent children's book publisher based in the UK. We publish the Poppy the Dragon series and share what we learn about self-publishing with other aspiring authors. Visit our website to explore our books and resources.