Nice photos, the cars are well positioned and the framing is nice too, but a lot of them seem a little bit too blurry at times. Some would look better with a shorter exposure giving less blur.
Moglet - Yes it is a little dark at times because that is REALLY effective for Metalic Silver cars
Dead_Poetic - Surprising no I don't use any software on any of my pics, all of them are purely from GT4's photo options. That means you can make these kinda pics or better lol