I actually really like this piece. It might be a simplistic sketch at heart, but the minimalist contrast is rather eye-catching. On that note, all of your drawings are pretty good. Of course I see how they could be better what with proportions, shading, and detail, but they're still really good and you have a lot of potential as an artist.
Let me know when you get animating, I'll be happy to do some voice work for you.