They are good. You have your style, the proportions fit this style. But to be honest: Do we really pay attention to exact proportions, when we wan to see huuuuge bellies :3 ?
Your drawings are good drawings. They capture emotion of your subject, but not necessarily all of the anatomy. I wouldn't use your work for judging on human human anatomy, but I would use it to learn how emotions are conveyed using the body.
Devious Comments
... Well, pretty darn good, considering the subject matter. It's hard to draw a body that realistically supports a beach-ball-belly.