nice image
i think it woulfd have worked better with your subject off to the left or right and the rail running diagonally into the picture - would have created some depth and more perspective
OK...I would like to like this but it looks to me, not like a low key light shot, but one where the daytime contrast was pulled out of the shot to make it look like night...I might be wrong, but it looks a little flat and you wouldn't get a shadow like that from the moon...not sure...might come back to this one and look at it again