The sharpest focus I'm seeing here is in the bullet holes near the bottom of the photograph in the center. The rest of them seem a bit soft. The shot is interesting though. Love the old look. I think it could definately be something on the front of a magazine, just with a tiny bit sharper focus.
Hmmm...I have a feeling that I'm getting a narrow view of this challenge. This is a very well done photo, but I'm thinking that if I saw this cover on the news stand would I pick it up, finding interest in what I could read inside? Probably not, unless there were other photos on the cover. I don't know if there was ever a picture taken of Bonnie and Clyde, that would be a great cover.
The color cast or exposure seems just a bit off, (maybe it's just the actual color of the car, but that's the feeling it give me anyway), but I really like your subject and composition. Creative idea!