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Zuko! I really wanted to draw adult Zuko ever since I saw the official designs for the middle-aged GAang. I'll try to eventually draw the others as well and perhaps sell prints at Sakura Con (my group's booth is Kamira) !
Personal Tumblr: [link]
Kamira Tumblr: [link]
Edit: Since people have been asking, here's the picture from tumblr that shows the older versions of the whole GAang: [link]
The poster is from the Korra panel at the San Diego Comi Con.