Are you providing graphics for car surfaces? It’s wise if you observe it on an actual model first. I recommend you using this mockup that shows a Volkswagen parked on the street. The outdoor scene makes this van mockup look more photorealistic.
You can paint this simple white car with your excellent shapes and colors skillfully. And finally, it is time to act; download this PSD file right away. Add your prepared artwork to the smart layer and edit it until you receive flawless results.