Cosmetic Photo Editing

My wife has been working on a souvenir programme project for a ballet organization. Her main task is to layout photos for the book. In so doing, she also has to edit photos she intends to use. I was quite amazed with what can be done. She removes wrinkles like prototype 37c. She can add hair as if the person used minoxidil for 6 months. Her edits can also make a person seem to have gone through a botox or lasertone job! Her only guiding principle is that the picture must maintain credibility. Meaning it must not look radically different from the real person. Oh... the wonders of technology!