If theyre paying you good then let them do whatever the hell they want. Display the real version on your portfolio and move on. Photos will get murdered no matter what, and those who respect the art behind photography will respect the money they put behind it to not manipulate what the photographer intended.
On the other hand, you can do a lot better. With that first photo, their crop looks better than yours for example. You shouldve had the guy in the left more inside the frame and took the chair out, and fixed the white balance.
Be glad they cropped your watermark out on the photos they made look like crap. You need to improve your watermark also. Its neither legible nor pleasing to look at. You dont need to distract them with it by putting it over her thigh, and you don't need a copyright symbol, it's copywritten the instant you take the shot, especially if you have your camera burn the author info into the image. The main goal for watermarking should be for others to find you, so you can get more business - nothing else. In todays world, a watermark isn't going to stop a thief from stealing your photo - which, in this case, clearly isn't going to happen anyway.