I'm not exacly a pro at animating, but i would recomend looking up tutorials, stuying others work on how it moves. The key is the frames and speed you animate it will make a big different. When it comes to boobs if you are looking at animating them think of them as bags of fat moving up and down, that the shape will change during movements etc. Sorry can't be of more help, i'm more of a beginner to animations.