I think that this really shines in the Color category.
Icon:
EDIT: Fixed White ROB and Added Icon
Also, bump.
It's really blocky and undershaded.
It really isn't the kind of thing that needs intense shading. I think it is fine.
It's more of a large sprite than pixelart.
Some shading wouldn't really be too bad, I think. Other then that make it a bit smoother in some places and it's pretty alright.