It's lookin good... increase the point density perhaps to get rid of the artifacts. How big is the car? Does it match up with the scene size as being as big as it should be? Or is it 10cm long...
Here's my 2 cents... the overall brightness needs to be increased, but maybe not necessarily on the background, depending on the look you want. I say to add the light from behind, facing the hood, to add another reflection onto the hood.