Hello,
my name is Liliana, i have over ten years of experience as a designer, and what i like most is to 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 coloring illustrations i made, 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 illustrations as vector format to print,
and also saved as any other digital 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, detailed and fun coloring illustrations for your book, with different styles and subjects.
Hope we can work together, please, contact me if you want to talk about the project, or if you want to see some more of my work.
Best regards.
Lili.