Few tips:
- never shoot at a car with headlights on (eg. 10 & 11)
- Pic 3 - 6, 12, there's no lighting on the car at all. Also, you've majorly oversaturated the image, as the colour balance is all over the shop. Next time, use ISO 100, F10ish and 30sec shutter speed. This should lighten up the car and even out the colours.
- Try to avoid using ISO800 or 1600. The images are too grainy, and lose a heap of quality.

Otherwise, good work, keep it up