i think you should possibly use a dark charcoal for the car. I realize you havent tested it but its a great look especially for luxury cars. If not i would go with black.

Can you post your settings for the shader when you have a chance.

And i love the modeling, think we could get a poly count and do you plan on doing any amination?

Personally i think a 360 degree turntable would be great.

Oh and like the tires they look great. Are those from another job or did you make them for this one? Details on them if you like would be cool aswell as im sure others would like to know how you made them.

Ide like if you could check out my concept car ive been working on if you have a chance any ideas you could give me are welcome.