Stefano, your alley is good, every detail is fine modeled and well inserted. The image has your style and is great... but looking at the real alley, you missed something... the orange-yellow ambience (even in the blue shadows). I don't know maya... my 2 cent are: try to increase a bit the light of the scene trying to keep the blue of the shadows. (hope it's clear, I'm trying to be constructive) Reproducing the light of Sicilia is not an easy task! ...but you can do it!