edit: hmm... i'm looking at this picture using a different screen than usual, and it looks like crap! do you see sort of strokes, and lighter areas to the right and left of the persons in the shot?

edit again: the photo is very low key, taken on tri-x pushed three stops using a wide open 50/1.8 lens. so if it's dark on your screen, it's because it is meant to be dark:)