Hello,
my name is Liliana, i have over ten years of experience as a designer, and what i like most is illustrate, that's why i like this project.
Please, visit my Freelancer portfolio https://www.freelancer.com/u/webpolis.html
to see some of the illustrations i made for books, in order to evaluate my work.
I can send you more samples, if you want to.
I use Illustrator for this kind of projects, i can deliver you the images as vector format ready to print, and also saved as any other format you may need, like JPG, or transparent PNG, for example.
I found this project really enjoyable and interesting, and i would like to create originals, clear and fun illustrations and characters for the 25 pages, cover and back. For the color version of the pages the price will be 150 extra dollars.
I hope we can work together, please, contact me if you have any questions, or if you want to see some more of my work.
Best regards.
Lili.