just from a quick comparison from ur model to a real pic:
1. the spot by the side mirror needs to be a little bit higher on the car i think
2. the actual tire rubber needs to be smaller and the rim needs to be bigger in radius
the rim seems to be a little bit too deep
3. this part needs to be curved in a bit too
4. try to make these corners a tad bit sharper if possible.
also found this hi-res pic which was what i was glancing back and forth with
good luck