I'd love to see more pics, and maybe more importantly- how straight did the body work come out? If the body is straight, no dings dents etc, and looks good on black paint, I'd consider that a minor victory in itself and move on to the final step of polishing out those wet sanding scratches. I know I'd be pissed off about the painter skimping out on the last important finishing detail, but eventually I'd want to get the paint polished out and then attempt to recover the money. Even if he doesn't pay for the detail job at least that whole project is finished and behind you. If the polishing estimate is some crazy amount like $1000 or something I wouldn't do it, make him arrange the whole job so the care, custody, and control of your car is through his shop. And then he'll most likely get a lower bill than you, which you can then argue the cost down even more.