You've been told about the background being off , different size of wheels and the flat look of the roof , something else I have noticed is that the lights glow in some strange blue-ish light but the light comming out of the headlights isn't blue , that looks kind of wrong to me. If those flaws could be fixed I'm sure , that it could look pretty nice

The concept is great and many issues have been expressed so just work on those in future chops. A few other things stand out as well. The chop has a jaggy selection around the whole car are you using the pentool to make selections. The sign I believe would not reflect on the windscreen also. The perspective is also off on the front bumper. There are more things to list but I wont carry on. Keep up the work and always try to improve.