I prefer to use smaller parking lots with a higher concentration of lights or place the vehicle directly under the light. (This requires lights posted in the lot it self) I don't currently have any night automotive shots of mine on line at the moment but I will prep a set this weekend and post them saterday night/sunday morning.
All on top of the previously noted lighting and background issue,
Strey vehicle, this can easily be composed out. Judging by the series I assume you had full directorial controll over the vehicles, all you needed to do here was mover the car it self to the left about three feet. you would have been able to get the same angle under the same light but that truck would be hidden behind the Mustang.
Again a strey object, this one partally obscured. Had the sign not been covered my tree leaves it would have been fine but the tree moots it. Also I was in a bit of a hurry and faild to notice the reflection of the pickup. Make sure that the other vehicles are parked in a location where they won't show up in the paint.
The stop sign and the pickup reflection again as well as some lens flare. This one can be countered in post by croping the additional dead space. Keep in mind wile composing your shots that you want to mimimize croping as it increases any niose and softens images should be a last resort. Move closer as opposed to a crop when ever possible.
This one suffors the most from lighting, to put it bluntly the truck color is not the best to shoot in the dark, furthermore many of the added components can not be seen either due to the afore mentioned color and/or small fine detail. this truck is better shot in the daylight. This image also has the strey objects and dead space, croping would solve those but moving closer during composition would have taken out that shadow and wouuld have been ideal.
Another strey object, Move that other truck and take a couple steps to the left and center the subject truck. Unfortunately this is the exact same angle as the previous shot, this takes interest away threw lack of variety, go with a different angle too.
Well the Mustang is cool, the F-150 is cool but the Ranger is just a simple pickup truck, and it's friggen yellow to boot. you have two dark colored vehicles that are more than your average joes gogetter, and then you put this bright colored average gogetter right between them. The contrast it creates draws attention to it and away from the ineresting subjects of the photo. Get rid of it, it has no part in this photo shoot. The size alignment was a good idea but that was completely negated by the complete lack of interest and attention drawing nature of the yellow truck.