I like the first pic minus the signs, they are very distracting. Also, it would be better IMO if the tire was pointed at the yellow centerline so it leads the eye to the car and up it.
Some things to consider, fill the frame with 3/4 of the subject. Always ask yourself what is the subject that I am shooting, look around in the frame for anything that looks like ti is "growing" out of the car. Don't forget to look at the window glass for any odd reflections or perhaps seeing through to something that would be distracting.
Some other things to consider, even though it is sunny, using a fill flash would do your pictures justice. It would help bring out the detail in the darker areas of your car.
I also like the 3/4 car shot, going from the front and down the side, showing 3/4 of the car, which would be like the shots with the brick wall in the background.
I think your car would be great photographed on a dirt road with srub brush in the background. I'd position the car, then shine up the black tires and rims so it will help add contrast to the dusty color of the road. Also, I'd focus on the car and have the background out of focus if it is a busy background or if the background will overpower the car. It's cool to photograph with a sunset, colorful mountains, etc..., but remember the CAR is the subject so make sure you use anything else to highlight and bring attention to the car. Some people with colorful cars can also try to focus on the front half of the car and blur the rest with the right position it could look awesome.
Good luck, I'm sure you will find the perfect spot!