Alright so here’s my two cents. Use cars that look good. Not like “ I like this car “ but more like “ I love to look at this car. “ next. Use more common colors. A black bmw doesn’t pop out, not does an orange Lamborghini. Finally set up your scene. If you have any thought that this picture looks bad, and tingle at the back of your mind, then Don’t take it. If you want to set it as your permanent background then you did it right.