Real or CG?

ok,no prizes for guessing..umm,here goes - alright so I have been working on this alley since almost 6 weeks,the pictures were taken from san francisco,I had to wander everywhere in sf to search for these textures and guess what the more dirty the place the more better,these textures were taken from the dirtiest places and composited together with some techniques to make it look real,I might work on it abit more,I am not yet satisfied with it.

Halloween is coming close,Guess what? next assignment is all pumpkins :D .

Btw the answer is CG - it was done in Maya and adobe photoshop.

Thanks for looking,

R.