Light painting involves a slow shutter speed and a continuous light source. You can either capture all of your light in one shot or do compositing techniques like the images below. Each image consisted of about 5-6 shots, merged by using layer masking.
You can see the tracing effect this adds to the image. There's a highlight streak all the way down the truck along with deep shadows from where the light was ineffective. With an extra pass focusing on the tires you can achieve a very detailed tire image showcasing the tread and wheels textures.
In this original composition there were trees coming out of the roof of the truck from the background. I cloned out the trees for a more geometric feel, changed the blank sky to a star filled slightly cloudy one from a photo I took out in Marfa, Texas. The vanishing point, combined with the architectural design of the building make for a composition with a lot of movement.
And you can't forget the grill...This photo, just like the others draws the viewers eye from the head light all the way down to the back tire then jumps back to the light from the building. Photographing this truck was so much fun, especially because it was my first vehicle shoot! ;) Check out the behind the scenes video below showcasing one exposure out of many that made up these final shots.