Ah, me and my dad's favourite fictional character :D We are such perverts... When giving critique, please tell me what you liked about the piece and what you disliked so that they can kinda cancel out each other, if you understand what I mean...
I like it, but mostly the upper part. The head is nicely drawn, as well as the body, but the body tends to get smaller when it gets to the hip part. Maybe you should draw her hips a bit bigger, because it is a female. The shoulders and the lower part of her body seems a bit out of proportions. But overall, I like it. :)