First of all, let me say that this book brings back memories of me playing Magic The Gathering cards. A lot of the illustrations in the book are from Wizards of the Coast. Francis Tsai is a concept artist and you can find his work on teamgt.com.
This book is not really on art techniques, there are no step-by-step tutorials to follow along. It's one that gives ideas to think about when trying to come up with a character.
That being said, the writeup for the book is pretty good. It gives a lot of ideas on things that can be changed or added to enhance the characters. It can be on costume design, colour combination, using silhouettes, thinking like the character itself, etc. All come with nice illustrated paintings as examples.
This book is more of a resource book that's great when brainstorming for ideas.
If you're looking for techniques, check out ImagineFX's book called Fantasy Workshop: Mastering Digital Painting Techniques.
There are more pictures of the book on my blog. Just visit my Amazon profile for the link.