Dear sir,
I am professional illustrator, character designer, cartoonist, digital painter, image editor and more.
I can work in many different styles and have experience creating artworks for many different purposes.
In order to give you a exact cost for a whole book, will be needed to know the style and amount of illustrations per book. My rates goes from $25 usd to $75 usd per illustration.
Please take a look to the following samples of my works:
https://www.freelancer.com/portfolio-items/246019-illustration-based-on-daredevil
https://www.freelancer.com/portfolio-items/246034-illustration-services
https://www.freelancer.com/portfolio-items/246056-character-design
https://www.freelancer.com/portfolio-items/246031-handmade-illustration
https://www.freelancer.com/portfolio-items/264803-caricature-for-profile-picture
https://www.freelancer.com/portfolio-items/259362-custom-illustrations
https://www.freelancer.com/portfolio-items/271756-digital-painting-portrait-design
Also, you can see lot more of my works in multiple visual arts areas in my portfolio here on Freelancer:
https://www.freelancer.com/u/GueloFilms
Contact me and let's talk in details.
Regards
Guelo