I'm not gonna get involved with the tiling comments. Agree with some disagree with others. However, as a plumber who tiles I will frown upon the isos on the shower pipe work. You've left a big hole around the pipes which you'll have to pump full of Silicon before fitting the exposed valve. Personally, you have no excuse for not isolating the water supplies and making these a neater 18mm hole.
Other than that, it's far from the worst I've seen. Snag it with the client, get it done and get paid.
Other than that, it's far from the worst I've seen. Snag it with the client, get it done and get paid.