- The car is toony in places (like the spoiler)
- the tires have a wrong hue (try autocolor)
- exhausts and interior look a bit low res.
- shadow could have been done better.
One additional thing.
The inner shadow, under the car is to ( hard )
Looks more like an oil leakage, than a real shadow.
Smooth it a lil bit and make it some percent transparent.