Not bad at all
Night shots are always tricky. The problem with leaving the headlights on is that it's going to be overexposed while the rest of the car is exposed properly. Posing under a streetlamp usually helps even it out.
For normal day shots, I usually try to shoot cars during the golden hour, right before sundown. This gives a more even light that is more pleasant to work with, and is less harsh of a shot.