"You may not reproduce, distribute, publicly display or perform, or prepare derivative works based on any of the Content including any such works without the express, written consent of deviantART or the appropriate owner of copyright in such works."
Unless you'd like to write to the illustrator of the book, the writer of the book, and the publishing company to receive written permission to post these works, you ARE breaking the terms of service. Please, remove these works from your DA!
If you want to display them, link to a website that allows that behavior in your deviant art journal--one suggestion, tumblr allows this.