Here are some suggestions you might not have heard of:
“Artists on Art” by Robert Goldwater (amazon link)
Thoughtful essays from great artists.
“The Art Spirit” by Robert Henri (amazon link)
Henri (pronounced hen-rye) was an American artist and teacher. He was completely committed to art-making and knew how to inspire his students.
“Artists Speak – A Sketchbook” (amazon link)
A collection of brief quotations from artists in all media, from painters to poets to jazz musicians. Personally, this is my absolute favorite book.
“Art and Fear” by David Bayles and Ted Ormond (amazon link)
Because every artist gets blocked ;).
“Drawing on the Right Side of the Brain” by Betty Edwards (amazon link)
A wonderful collection of exercises to build skills and expand perception.
“The Natural Way to Draw” by Kimon Nicolaides (amazon link)
This book is on my wish list.