Sure, in professional car shoots they use additional lights for that but I don't think it's a must have.
First of give us the EXIF info of this shot. What's the shutter speed, aperture, ISO, focal length?
This shot of course is way too noisy. I wouldn't have a problem shooting this with ISO 100 at f5.6-f9 with longer shutter speeds just to avoid the noise.
Your friend either has to hold still for as long as necessary if he wants to be identifiable but personally I like an element in the frame that is blurry especially in long time exposures. So he could be actually walking around the car which could create some nice effect.
Also if you wait longer until the sun is even further down, just do a 20 second exposure having him walk around the car with a flashlight. That would give you some funky streaks.
Play around.