Nice idea indeed, the biggest flaw is the reflection is wrong, it should be going across the bonnet and window, not up and down.
Also try putting the reflection layer into Overlay or soft light blending mode so it doesn't look like a ghost/ faded
Like ATC said, please be careful where you get your parts from, as you used parts from another chop which we consider as 'stealing', Just be cautious, if you are unsure feel free to ask someone.
Consider it a warning/ learning curve.
Cheers
J