I made a lot of test renders before reaching the final render. For this I used V-Ray RT, which is a very useful test rendering engine because it gives you a fast render and allows you to see everything and change anything. I started off using low values in the render properties and once I'd checked everything was okay, I increased the values.
Final render properties
I'd also recommend that you use Render Elements, as it's a powerful tool in your hands!
Render Element settings
Photoshop was the program that I used to merge all of my render elements and composite the final image.
Compositing progress in Photoshop
The next step was to add some car headlights. Creating headlights in Photoshop is very easy. I started by making an elliptical shape selection.