I preferred it before you blurred the background, but the second one is definitely the best

I like the light colour, and the background fit is better
Both wheels are a little small though, and the perspective of the rear wheel isn't quite right - it needs to be narrower, so that you see less of the wheel
Reflections on the car on the final update are the best though, but still not quite right - try and look at photos of real cars, and think about how the light is hitting it to cause reflections
Other than that there's some nice ideas

A good effort at a difficult chop

Good luck in the competition