Heres a 2 minute edit... nothing much.. But you should try to up your color count atleast a little bit... try not to make the thing all one color, it reduces from the uniqueness of it. Also, you should try to choose a light source. If you dont know anything about light sources, you can goto
www.spriteart.com, there are plenty of tutorials for many different things concerning pixel art techniques. But anyways, here's an edit for ya bub.