Rawessence,
Welcome aboard! Wow! What a difference! Very good work. You've done an excellent job in bringing out detail, and the coloring is great. I'd be a little reluctant to remove the background if it has any significance whatsoever. Now to nitpick!!

The gentleman's right hand seems to be overdone a little (blurry). Possibly you could use a layer mask to correct it? It's hard to say too much with a small pic, but it looks like you might have lost just a little detail in the car in the background. Checking the channels might enable you to bring out *more* detail. If you could get enough detail in the car, that could be a good indicator of the time period of the photo. That's why I wouldn['t remove it too quickly. It looks to me like you have something to offer the rest of us. Stick around!
Ed