Wauw! Nice model lealar. That put's my efforts at cars to shame.
It will be looking great after you get the headlights and air-vents in the bumper filled in.
Not quite sure what you mean by "help me make better ok of rend?"
If it's about adding detail. Sorry - I'm not very good at that at all. (yet)
If it's about improving the look of the car then, how about using the "Mi_car_pain_phen" shader for mental ray? There's also lots of shaders around for doing metallic or pearl car paints.
Also, search for
Tutorial by Cris Hunt at highend 3d. Don't have a direct link, I've only got saved version on my hdd.
Also, here's something I've got kicking around - never used it though, so I can't offer any help on it.
Hope that's what you meant.......