to create natural movement in animation it's important to remember that almost the speed of every movement is distributed parabolicly, this means that in the extreme shots you need more frames than in the movement itself. this is because our limbs (or for that matter, usualy any matter) take time to get up to speed and to slow down so are at top speed in the middle of the movement. so when animating its very important not to blindly use the onionskin function to move all moving parts 1 pixel. now you don't seem to do that, but i think you could still use some extra frames here and there and perhaps even lose some. if you hate animating hair that's okay, you can totaly get away with not animating it at all (provided you don't animate it anywhere), however if you do want to anymate it try and get some visual reference and redo because this does indeed look like sh*t.