I agree with Helspawnuk, it's a good model, but it looks a little to edgy. Have you tried softening the normals?

As for your question in your first post, I think you could even slice off a few polys here and there, the grill above the front bumper e.g., and maybe add some of it with a normal map instead, and spend those polys elsewhere. The mirrors could use a couple of more polys to round them a bit.