Dont know what I could say about this.
The door shutlines are always a dark line, and a brighter one (check the 2 trillion shutlines on the original).
Think the wheels should have a more blue/cyan hue than orange/yellow they have now.
Brushing is glossy on some parts and then very matte/toony looking on others. I cant brush cars myself so dont know how you could do it better

Finally, instead of stretching the top of the bg after lowering you can just crop it off.
Keep the chops coming, improvement comes with it!