Nice attempt. The lightning is a good touch. The crop lines are quite noticeable down the bottom, but a quick fix is to clone the background just over any rough edges. I feel that it would be better to have the car a bit brighter too, and to clone the camera flash off the passenger's side fender. Also, the car appears to be floating, so would look better with some sort of platform underneath it. That's just a little constructive criticism though, all in all I think that's a pretty good job for your first time using Photoshop