The car looks out of proportion to it's normal size. The thing in the upper right hand corner, hmm, is it an attempt at a light source?
I would probably keep it flowing throughout the body lines of the car, instead of what you're doing. But, it's pretty to look at.
8.5/10 because you can do better D:
The car isn't out of proportion, the Saleen S7 is a really long supercar, and I think everyone knows that. Yes, that thing is kind of a light source, but I later brushed something over it, however it made it look a little better, so I kept it.
7/10 for you, OGKing.