I just wish the car wasn't so underexposed. The background is great, I would just like to see the car brighter compaired to it. But yeah, you can't see the wheels because of it.
Composition is good though. If I had a wall like that I would be shooting cars there constantly.
Here is a graffiti wall in Minneapolis I have to work with. The coolest part is the artist redoes it every spring.
Nice looking M Coupe. I like the shot as well. Great composition and lighting on the wall. Maybe a strobist approach on the car to light it up a little bit but not too much.