Some constructive criticism
1-3, the lighting is wrong.
1st - Complex foreground takes the attention away from the car. Crop it down a bit. Also I'd reduce the yellow in the photo.
2nd - too much flash lighting in the foreground again, causing an imbalance in the photo.
3rd - I can see what you were trying to achieve. next time try from a lower angle, and zoom in a bit more, trying to cut out as much bright background light as possible.
4th - Good shot. Crop it, decrease the highlights a little, bit more contrast and black level.
5th - Bit more saturation, bit more black, bit more contrast.

Hope that helps mate. You're doing good.