Thanks for the comments. I definitely wish they had put some exhaust smoke in there to help sell that effect a bit more.
But the matte gray paint does look a bit weird. It's as if it had a lot less contrast than the rest of the image.
Yeah, it's a bit off. They also removed a lot of the shadows under the car which makes it look like it's sitting waaaay up in the air too. Guess I didn't have the car defined well enough with the darker contact shadows, etc..
No, it's not me in the vehicles or reflections. I'm not sure who that is.
All of these are back-plate comps, so technically there isn't any ground texture/asphalt/pavement. Just the shadow catcher material in combination with the back-plate. When I do have to make asphalt I'd use a displacement map if the camera was very close, otherwise a normal or bump map should work fine. I'll see if I can create a decent looking sample that I can share. :)