What you could do to refine the animation is to have one of the arms and legs painted a different colour. This would help you see how the legs are cycling. I usually do this with walk cycles and then I go back and repaint it after I'm happy with the animation. At the moment, there is a "back and forward" pop on one of the back legs.
Also - a slight head bounce by a pixel could give it a little more life.
thanks a lot. I see what you mean for the difference of color that will help a lot. I want stay in 2 color but your right I can start with 3. I dont see the back and forward but I will look today.
edit:ok there is a probleme i have to look at it in the end of the animation. I do something not sure it's enough. thanks for looking. I try to bounce the head but it's to small i need to find a solution for that.