George, darn it, I can't believe I don't have a fin clip photo. Here is the drawing that I use in teaching one of the classes. The left fin was clipped and did not re-grow. The middle one re-grew, but is deformed and recognizable. This actually is a very good drawing of a situation that I commonly see. If you initially clip the fin down very close, you usually can tell (I'm not saying 100%, but usually). The right figure is a fin clipped in the middle and then after re-growing, you can see the change in the fin rays and recognize the clip. In my experience, this partial clip is not always very recognizable -- it varies among individual fish.
So, this is NOT as good as a photo. However, I hope it will be helpful.
