This is looking pretty good, the motion is nice. The Head doesn't fit on the body at all though, seems to be in the wrong perspective.
The animation is a bit jittery in places, you really need to pay attention to each individual part and make sure it transitions smoothly frame to frame between the keys. I like to draw some place holder dots first just to plan out the smooth motion and then draw the character over them.
Is this intended to have clothes added to it at some point? The breasts are pretty gravity defying at the moment.