they are some really nice shots. there isn't much wrong with them looking at the car. 5-8 the sky is really washed out which happens with the exposure you are probably shooting. 9 i wish was a little crisper, its a really nice setup. i think 4 would look better without the border fade, it kinda cramps the photo if you know what i mean. did you shoot in that alley with your car angled at all? that would look pretty cool i think. nice shots though!
you should go back there with a chick and have her dressed all mechanic-like with some grime and oil on her acting like she's fixin your car. thad be hawt!!
oh #1 is my fav, just wish the chrome on the wheels had more pop to them, the setting sun really killed their tint. maybe try shooting with a polorizor too? crop the photos together or something crazy?