Imo you should remove that white line (not drugs) over the car, maybe you can keep it behind the car but not over it.
I dont like those lines coming from the car, either (the ones goin' straight up)
It looks like the car has been duplicated and overlayed since of the blue stuff next to the white (caused by the light)
Depth and flow isn't the best in this sig..
Don't really like the text either, and the light is all weird.
feels like you could have done it a little bit better..
maybe you didn't notice but there are 2 white outlines below the wheels (render-shit)