car looks good. I like 3 and 4 the best
1 doesnt do much for me b/c of the overcast day, maybe if there was some scenery in the background to make the car stand out it would be much better ( the composition isn't bad) or maybe if you had some off-camera flashes to work with to get some more light on to the front 3/4 portion of the car, or atleast the wheels.
2. looks just like a simple capture, dont take my critique too harshly though, ive been shooting cars for a while, thats about all i shoot, and i get bored really quick with the simple shots b/c i see them every day 
3. This shot is my favorite. It could have been even better yet i think if the car was a bit more to the left, and zoomed in more leaving the overhead blue exit banner slightly to the right with a bit more blur (longer lens zoomed in further, or slower aperture)
4. nice shot too, next time try getting a LITTLE more lower to get a bit more perspective, and again with this one, see if you can incorporate some sort of lighting to bring back some of hte lost detail from the beutiful (and already really dark) volk wheels and tires
other than that, nice pics, just shedding some light on how i would change them a bit 