Thats actually a pretty decent brush attempt mate, nice work with the 2dr conversion too.
But personally I think the final image doesn't really pop out/ appeal so much.
If you dont mind, I went and applied some contrast, and used the Burn tool onto areas where the car is darker, see if you agree that this looks better.
Also because I'm picky, I noticed the selections on the bottom half of the car/ arches/ lower bumpers are jagged.
If you are using pentool to make the selections, try making selections with 0.3 feather to make it more smooth.
