Thank you for criticism and tutorials, I will be study.
(sorry for my english, I am ukrainian man)
Your lines are messy, and sharp. I'm suprised it made it into the gallery. I would suggest working on the line art, and adding some AA. you should be able to do this without adding any colors if you don't want to. A visit to the noobtorials would be wise.
noobtorials: http://www.pixeljoint.com/forum/forum_posts.asp?TID=5692&PN=1
I'm sorry if i sound a bit harsh, I look for improvement in everybody.
Ey, there's not so bad. I approve it xP