So kudos for the effort but there are some issues with the skin that I've noticed.
1. You have used a carbon texture PNG on the AO rather than the conventional method of using the txDetail with an alpha layer in the carpaint AO file. You can have a look at any of my skins as to how it is supposed to be done.
2. Most of the lines are pretty jagged and don't follow the lines of the car, such as at the front and some at the rear. Maybe some more time can be given to that.
It's a good start in skinning, but you should take your time with the skins tbh and feel free to reach out if you want any help along the way.