All in all, well done.
But there are mistakes nevertheless.
First of all, although you made quite nice reflections on the side, it is still visible that your base came out of a studio. Especially the windows need new reflections.
Furthermore, the lower part of the side should reflect the road, not the sky.
I really like the futuristic shape of the side though.
But the rear wheel needs a shadow from the cover and the front wheel seems too close to the upper edge. Both wheels are a bit too bright.
The diffusor you used is nice, but also from a studio-photo and possibly slightly off.
The new background fits perfectly, apart from the illumination, which does not match the direction the light comes from at the car.
All smaller changes, like the cleanings, are well done.
You know you wanna click it!