I don't know how qualified I am to give a critique but for me, the strengths of this piece are is textures. The fabric of the pants (of the man on the receiving end of the boot) is subtly different than the brick of the building and the leather of the Bat's boots. It doesn't look "flat" but rather, each surface tends to have it's own texture. Look at the metal of the gauntlets, the sheen of Bat's cowl and you'll see what I mean. I think this piece is astounding for that reason - but not JUST that reason.
I think my favorite part, is that even though batman is superiorly athletic here, hes not like abnormally huge like some comics like to draw him, which for me retains a bit of the realistic quality that batman has
Oh... I just have been a while since I don't come around DA and when I read your reply I just thought: "Wow, what could I possiblly to get such a straight foward insult from Mike Mayhew?" hahaha And thanks for the answer!