I love it, and I think you've done most of what you can with regular pixel motion save for a few jigglies (feet passing frame, right hand extreme frame). Although, i think he would be really cute if he wobbled side-side.
What you need to do now if you want to improve it technically is get into subpixel to make the movement a little more specific and fluid. If you don't know the term, a forum search will take youto places that will explain it far better than I could in the moment I have before getting back to work.