Looking good! Are you modeling the car in pieces? What I do I model a car like it's actually built--doors are separate, the hood, engine... Hell, even the windows and gas cap!
I am working on an entire 3D City, and its insane. I have learned so much about little things like man holes (textures) and having to model 4 different types of traffic lights--even a 3M type of light--it's the type that is usually yellow, and as you pass under the traffic light, the lights in the housing seem to go dark.. 3M uses a type of focusing lens.. its really cool..
I'll post some screens of the City--I have 8 blocks done so far. My BP Gas station alone is like 40,000 polys.. ugh!
I'll be selling each building, tree and street light/sign on a 3D Website soon, so it'll be a way to show them off in a city setting... (I also designed every single Construction sign in existence I think--even the digital sign that is a trailer--the type that people hacked to say "Zombies Ahead! Run!"