This is really nice, some critique I'd like to give on this is:

The blood looks okay, but it's not consistent on every person. (and on the person in the middle, the blood looks really pink, not red) The guy on the far right's blood looks best, most realistic for this picture. Otherwise, the light looks pretty consistent for each character. Another thing just in general however, is that the folds on parts of their clothes don't really make sense to me, so if you didn't make quite so many in certain areas it would look a little more planned.

That's all I could spot immediatly, hope it helped