Take what Helm said, and make it the complete opposite. I like the flat shading. The problem I have with it, is that it's kind of strange that her boobs are moving all by themselves. I know breasts are attached the pectoral muscles, which can be flexed. However, I'm pretty sure it's not at all possible for them to move by with such control, unless the girl were to be shimmying her shoulders, in a lusty, 1950's sort of way.
Still pretty funny, though. Hah!