The only pic in that scene is the Sky, I need to play with the light setup a bit to get rid of the brightness of it. Also using a sand texture for the ground now.
the rim looks nice, but there are some black things on the tire[don't know what are they(?)], why don't you post it on cg-cars.com or sektor-41.com? there a lot of helpfull people and they can help you to do model well
Looks interesting - displacement/deform on left side looks a bit artificial. Light is also too focused. Either increase cone angle and/or move it further away, or use a directional light source.
Mustang: sweet lights should be chrome and not gray (as they appear to be atm).. imo.