I highlighted the banding in one of the frames with red. http://img833.imageshack.us/img833/4656/bandingt.png
Basically, banding is where you pixel around another outlining shape or line. It's something you should try to avoid while pixeling.
http://www.pixeljoint.com/forum/forum_posts.asp?TID=11299&PID=139322#139322 goes further in debth on what banding is and why you should avoid it. Definitely recommend reading that. :)
Thanks a lot for the feedback. But what do you mean with "banding" ?
Nice work. However, arms and legs should not move simultaneously on the same side. For example, if the right arm was to move forward, it would be the left foot that moves forward with it, not the right. Also there is quite a bit of banding, especially on the top of the bears head. Regardless, nice work. Keep it up. :)
No worries, hope I helped. :)