Hum! Is it going to be animated? That'd help me with what kind of crits to give.
Also with the shading you've given it it seems really round, like a ball, almost, is that the intention? Also, looking good, I can see you're getting to know those pixels. I think working with fewer colors would've helped you in THIS stage, although I'm fine with the end result having this sort of palette, cause I can love me a multitude of colors and smoothness O: