Nice concept.

Simple, but still colorful and stylized. I really think the shading has a lot of style. Very unique... It's not realistic, but it's sure unique xD Not to mention cool, mind you. I really like how you did this. I sort of like the background but if you had left it blank I think I would have liked it a bit more... I'm not entirely sure about that, though. I like your signature in the corner, by the way.