Child Book Illustration

I am looking for an experienced illustrator for a childrens book. The book is 11,000 words which will be around 55 pages (A5 size) and this is the 6th book in a series. Each page should have an image so in total around 55 pages. There are 6 main characters in the book and so the illustrator will need to be able to draw these characters. The price is negotiable depending on how many large, medium and small pictures we agree on. There will likely be 20 full images, 20 half page images, and 15 smaller images. See images attached as an example. There will be the front and back cover also. Anybody interested in this project would be expected to prove that they can draw these characters accurately.