Interesting...
I have no idea where they are or whether or not they're alone, and I'm not sure whether the atmosphere is scary or sad or both...AWESOME!!!
The shading and lighting are great, and the facial expressions are fantastic. The background is pretty simple, though. The alley, which I think it is, needs a dumpster or some other alleyway "furniture", and it would be more convincing if there was more rain in the foreground for it to look like it's raining. One last thing that bothers me is how thin the female character is at the waist and legs.
Overall, the picture is amazing, and I'm just trying to point out a few things that might improve it. AWESOMELY AWESOME PICTURE!!!