Apparently the boobs have life of their own.
Funny comment aside the animation needs some work, there's no weight in the movements, the hair and the coat jitter from one side to another, the shadows on the hair constantly move and it doesn't loop properly, I read that you wanted to do some jiggle physics but without moving the rest of the body or at least the top half it just looks weird, for your first animation it's ok, hope you can practice more and get better.