1. The breasts feel like they come up too quickly when the bounce starts; the right breast sort of snaps to point upwards while the left one takes an extra frame to do so. To my eyes it feels they should be level

2. The right breast bulges out during the third to last frame of the descent. Considering the motion I think it would smooth the animation out if that wasn't the case

3. The hair animation could be simplified; on the second frame it jerks around which feels jarring. Less is more here I think, to be honest you may be able to get away with warping it if you drawing program allows it

4. I do appreciate how you haven't compromised on the rendering :) I can't imagine how long that took. Of course if you're doing a longer animation don't be afraid to simplify it

If didn't know about it, the Animators Survival kit is basically your Loomis but for animation. My old lecturers used to recommended it for character animation and I have seen it used professionally.