hi, I really like your art! but I redrawn it for myself and I put it on this site too. but do you mind that I show it, while it's actually your art? sorry for my English. I'm dutch and 14. In my comment is said that it's your property. please let me know if you don't want it. then I'll delete it. link: [link]
Wow! I can see you really like Avatar alot. : D You can start by using cones and balls to construct your character beside you put details on them something like this [link] It will help you get your forms, poses and perspective right.