Concept-X - Very nice stuff. Reminds me of JJ72 edit, but this is also sweet.
jrd.racer - It looks like you've used rims that were not already on a car, right? Or from some kind of render.
Well, I would advice you to find a real image with the same angle and use rims that are already on some car. It would just have brakes and stuff on it, yours look like it doesn't have anything inside the rims.
Maybe I am wrong, but I remember I did same mistake when I started changing rims and they looked kinda like yours.