The wheels are too 'blurry' - they don't look solid.
The chrome is nasty, but not if black would look better of it is just simplistic lighting.
The grille image is very 2D and rubbish. Either improve the texture (with a displacement map and an opacity map) or model it in 3D properly.
don't know what type of render engine are you using, but i hope there is a setting for color mapping, in v-ray if you set it to exponential it reduce the overbright so you can create much better chrome things, here is a picture where you can find it in v-ray:
im sorry to tell you, but imho the surface of the car has a too much plastic look. a painted metal surface has much more shine and glossiness (if cleaned and waxed proper). try to increase the specular level of the skin..