The hips should move up and down, not just the head. Right now it looks like his upper body is expanding/contracting when he moves.
You could of course add some more frames for a smoother movement but I don't think it's necessary, just slow down the animation a bit and it should look fine.
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You could of course add some more frames for a smoother movement but I don't think it's necessary, just slow down the animation a bit and it should look fine.