good job on fitting the body. But the car looks desaturated. Try to color the refs a bit, it would look more realistic.
this is how I color the refs of a black car:
- create a new layer on top of the body of the car.
- Brush a few colors on it (like blue for the sky, green for grass and trees...)
- Set the layer on 'Color' and lower the oppacity if needed.

The shadow could also use a small gaussian blur.

The chop looks good, but it has still some work.
keep it up!

Thanks for the advice i'l remenber at the next Chop