Your stick is wobbly, a little stiff and the head resizes a tad. The explosion particle need the most work how ever. To fix this, don't just scribble to make particles. Draw each piece individually to get the best effect. That being said, however, you should practice some of the basics. Easing, physics, smoothness and basic stick movement.
Judging on the way your looking now, I'd say you should post your next anims in the beginners section until your ready.