well, for a first try that's very good! The feet were very wobbly in the walk though, and it was pretty stiff. Try to use a better stickman, such as these: http://www.droidz.org/direct/3247
It would also look a lot better if his joints moved more in every frame.
Wow, very good for a first few tries. It's quite smooth and your movements are very good for a first timer. My only advice here is to keep the movements flowing and try not to make it stiff.