Alright. I'll pick on you...since I have nothing better to do.
I once worked with the editor of a bunch of car magazines (primedia) and he told me a lot of tricks they do with cars to make the pictures perfect.
Try turning the wheel so that it is perfectly straight up and down with respect to the spokes. Then turn the center cap to match.
clean the entire wheel, including the tread...but not with armor all or other shiny stuff. Best use a product called "Wesley's Bleach white". Or -
Turn the wheel away from the camera, instead of having it pointing straight ahead. Basically so you can see more rim and less tread. It supposedly adds action to the picture.