Yeah. This just sucked. No offense, but if you're going to make srb2 sprites, don't treat MS Paint like a crappy doodler designed for 8-year-old kids.
For one, you need a little more shading. use some slightly dark yellow in there. Otherwise, I guess it's okay.
But second, those are crappy holes. They're supposed to be dark yellow, and they're too freaking huge. You can probably see his brain through there (whatever size it may be).
Third, you made him a rounded cylinder. He is a soggy 2-dimensional rectangle, not a 1-dimensional rounded cylinder.
Fourth, the clothing his incorrect. The sprite's wearing a suit and brown pantlegs when it's actually supposed to be a white shirt and brown pants.
Fifth, you gave him fangs. Make the the teeth at least a pixel wider.
Sorry if it seems like I'm throwing a verbal grenade at you, but really, this sucks. The only effort I see in this was copying the pallettes. If you're still working on this, keep this things in mind.