I just recently got the book called "Avatar The Last Airbender: The Art of the Animated Series" And I have to say, this is a great find, the book is HUGE! Alot bigger then I thought, it goes back into the early days of Avatar, when it was planned to be set in a cyber futuristic environment, and then covers it's evolution to the fabulous work of art that it became. It features discussion by Avatar The Last Airbender creators, Mike and Bryan as they talk about their thoughts and ideas for bringing Avatar The Last Airbender to life." In addition there is a short forward by Director M Night Shyamalan talking about his fascination with the show.
I couldn't recommend this book more highly, excellent addition to any Avatar The Last Airbender Fans collection, and if you are looking at doing some fan-art you couldn't ask for better reference material!
[caption id="attachment_1285" align="aligncenter" width="375" caption="The Art of Avatar Book Cover"][/caption]
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Check out some Examples of what you'll find in the book
[caption id="attachment_1281" align="aligncenter" width="308" caption="Zuko Sketch"][/caption]
[caption id="attachment_1282" align="aligncenter" width="549" caption="Early Renditions of Aang and Crew"][/caption]
Those images are just a small sample of what you'll find in the Book.