Like tjohn said. Most of the time those grilles are done by texturing rather than modeled in the mesh. So it's likely there's a trans-map for those parts that appear solid in this clay-style render. It saves on a lot of polys. (And when I say a lot, I mean A LOT. Especially if it's smoothed. Anyone else ever try modeling the grille mesh besides me?) Looks good, but the body panels around the lights do need vert tweaking. A bit of a pain, but worth it. Right now it looks like somebody cut the openings with a saber-saw. If you plan on selling this, nitpicks like this count.

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Barbequed Pixels?

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