It needs more highlights on the side and all over the car. Don't use so much the overexpose /underexpose tools for the brush, you have to use more color tones.
But i think i can't reduce the noise afterwards...
Go to Filter>Noise>Reduce noise...
Yeah, i know that way, bit i think it won't look very good at the end.
Before i finish the chop i will do that, when the brush is finished (reduce the noise).