You need to get a hold of smooth paneling movements. If one reads slowly, he/she's going to have a hard time getting what's going in.
Well from what I can see, the kid's punch missed, giving the guy with shades an opening but a direct punch returned out of no where and I don't know who hit who. I suppose it's the guy with shades given the fact he HAS an opening.
So what does that imply here? You are missing 1 extra frame to show that the guy with shades took the opportunity to hit him back, a quick movement panel. It could be either portraying quick movement lines only (Yes that would be sufficient) or the guy with shades returning the punch.
And it does not show any impact at all. You should make use of movement lines here. Add several vertical lines on the background to show the immense force applied. It will further enhance your frame :3
Now the forth frame, try and refer to how Uzumaki Naruto's movement lines would usually be when he's doing Rasengan. The lines would curve outward and spread open originating from the punch showing the immense force put into the frame, further enchancing it :3
Righto, next is the proper way of drawing debris. If you noticed, must powerful and forceful punches which are able to break walls always cracks like a circle. Thus different shaped triangles are mostly what will fly out and (There can be squares too but try to make them shaped randomly is a better suggestion) also, they are small in size since it is after all cracks flying out. Yours came out looking like big lego bricks ^^;; And like before, to enhance the forcefulness portrayed, add vertical movement lines on the background too.