The eye is nice, exept that the bottom is ridget and seemingly out of place. I think that's a fairly eisy fix, though.
Then the little tan thing (not sure what to call it) seems laking basic anatomy and structe. It's kinda cute, but lacking a real seriousness to it.
I don't know what tablet you got or how it works, but when I had photoshop and other fansey programs, I scanned my hand drawn sketches and created lineart and than colored. This way it was close to my origonal sketch idea. (But now I've got a new comp w/ nothin on it... *grumle grumble*...)