Your feet are still twitching on one frame. Fix that and you'll be much closer to fixing your issues.

I'd remove the blinking but that's just a small nitpick.

When Mystery says your lines are twitching and bouncing all over the place, Mystery is talking about for example, the belt and bottom back of the skull. The belt seems to be jumping up and down and the shape of the bottom back of the skull is changing shape throughout the animation. Also, the black pixels on the front of the bandana move on a frame.