We all read the original post, and we all know that people will not vote for the composition and picture quality with that vague weighted subject.
Maybe you could throw in a stipulation of "no exterior shot of entire car" or something. Certainly not fool proof, but better. Maybe even a macro competition, where the goal is to take an image and have people guess what car it is.
lol, I suppose I'll enter maybe my entry will be voted on properly.