I noticed a few things looking at this.
Firstly with the head bounce. It looks kind of strange that the head would be bouncing but the shoulders stay still. The only reason the head should bob like that would be because the whole body is moving, and the head is following the spine.
This leads into my second comment, the whole thing looks very slidey, move that body some. The head should be connected to the movement of the shoulders, and maybe have a bit of delay as it adjusts to the bounce of the whole body.
The last thing is the hands. Its probably because the shoulders are so narrow compared to the hips, but it looks like his hands are just rubbing the sides of his hips instead of hanging freely. You have included some anatomy here that leads me to assume that this is a male figure, but the profile looks very feminine because of those wide hips and tiny shoulders.
Either way, the arms would probably look better going straight back and forward, with a little motion toward the inside at the apex of the arm swing.