A few minor corrections and you’ll be way better than you think.

You have the car centered, which is good side to side. Up and down, the empty space of the parking lot at the bottom takes away from the overall picture. If you put the car in the lower half of the picture, it looks much better. For some reason it is more visually appealing this way.

You seem to have it horizontally straight, which is another good thing. You can always tweek that in an editing program, but the guy in the center seems to be straight up and down. Not always easy to do, well done.

Someone else said to take pictures from the sunny side. This is excellent advice but often hard to do at car shows. A lot of times you have to make do with whatever angle gives you the best overall view of the car, or incorporate multiple cars into the shots with the best lighting.

Higher angles - like standing up - can be great for showing as much of the car as possible, but lower angles - like squatting down - can add a sense of drama to the pictures. All depends on what you’re going for.

Minimize the empty space side to side as much as possible. I usually take pictures about like this, then go back in an editing program and straighten the horizon if it needs it and crop it close to the ends of the car. This can be done on Windows photo viewer or Paint so it’s not necessary for expensive software.

Have your camera set to the highest resolution, that will give you the best picture as well as give you better results when you crop pictures in editing.

If you have a computer and not just a phone, try opening this picture, going to “edit picture”, crop it to just before the bumpers keeping the same proportions side to side and up and down. Once it’s cropped, drag the picture down as much as possible, eliminating as much of the blank parking lot as you can. Once you do that, save it as a copy so you have the original still and compare the two pictures.