Some comments: (meant to be constructive, not mean. I haven't done much car photography but I'll try to give you some general pointers.)
-Forget the tilt in any pictures. Especially when you can clearly see the titled horizon line. Straighten em out. My facebook pic is tilted, but that's facebook and not photography. naw mean?
-In one pic the suby is being impaled by the yellow road lines, try to avoid that. doesn't mean you shouldn't include them in the composition, but don't have em cut the car in half. after all, the focus is the car.
-the one below with the white car and blue stripes has a cone popping out of its hood. also there's another random car chillin in the back, remove em. I like the angle though, you kept the car below the buildings giving it a clean background.
-in the shot below that I can barely see the car with all that's going on in the foreground, but I like the idea. try cleaning it up a little.
-next one is tilted and has a tree growing out of it. again this is a difficult problem with photography in general, but if it's not adding to the shot (or it's growing out of the subject) then it's subtracting from the shot.
-next one is pretty blurry, difficult to tell what's going on. looks a bit like a snapshot
-parking garage one is cool, the spot has potential. work on lighting the car, maybe getting a polarizer to cut out all that glare. car lighting can be decently difficult, but I've seen tons of tutorials online to get you started.
-the stuff you have going on with lights is funky, but just make sure you can still adequately see the car. or at least have some back lighting so the car's outline is still visible. I think that plus some low lighting on the front could maybe work well.
phew, hope that's helpful. and just remember to keep shooting