I like the urban sense. His legs show movement which adds interest. The curved metal sign against the flat stone building is a nice variation with a leading line aspect as well. The light hitting the top of his head helps highlight him as the subject. I like it.
If the alley is superficial, that sign must feel pretty pointless hanging around announcing the fact.
The man in the background helps to anchor the scene, as well as adding a good reference for size. If this alley gets any traffic at night (or could have traffic placed on it at night) you could probably get an interesting shot of the passing car head/taillights illuminating the sign as they pass.