Tbh it looks like a big gradient with a wave reflection. PLEASE just use pictures as reference in a similar background/environment. You cant just know how to brush an entire car from 0!
Regarding the wheels, they are taken straight from an outside donor car, why didnt you change the colour to fit the inside setting? Just take away the orange and blue hue and your done, takes a few seconds and would have added loads to the realism.
Just trying to help of course..