Neat!
I really like your shading. It does seem to capture the proper manga feel.
Your background is nice as well, did you draw that out too? I suppose the only issue I have is the footing. The thug on the right (lets call him thug2) is the same height and size as the thug on the left (thug1), but judging by their foot position, thug2 is closer to the action than thug1, yet he looks no bigger in terms of relative distance. Perhaps if his image was bigger to properly portray that he's closer, or move him up a little to put him on even ground with thug1.
I'm assuming your protagonist(?) is airborne, so his hand at the bottom is acceptable. Otherwise there'd be the same issues.
Very nice work.