I'm going to be the first to say "I can't read the shirt." Seriously. I have no clue what it says. But the concept isn't to hard to grasp...Batman wearing a tshirt (and one that look quite sweaty at that.) Very creative work, i have seen this pose before, however i am going to give you a 5 for originality just because of how creative the tshirt idea was. The moon is great, i really love the whole sky scene. Batman's eyes tend to blend in perfectly with the moon as well. I really like Batman's look, i haven't ever seen him protrayed this pissed looking.
As far as negative critique goes, try adding more definintion to the wrinkles on the shirt. When doing wrinkles and bends in clothing it is best to stay away from black lines, however if your personal style encourages of it, make sure to throw a dark shade under each line (With the brightness of the moon i'm not sure how dark it should be, but probably not very dark.) Good job on the white highlights though. Spledid. Also more bats would be nice, it looks kind of dull with just a few bats. Maybe even some more smoke would be nice. Can't have to much smoke (okay i'm sure you could but you get the point.)