We have featured a tutorial on here from makeup artist turned photographer/retoucher Gry Garness before. This one is a tutorial on how to pop the highlights and create shimmer in the skin. Without a doubt Gry is a master at her craft.
Now this isn't a full retouching tutorial, this is a final step in Gry's post production process. She mentions in the video that if the skin retouching isn't absolutely perfect on the layers below that this effect will only exaggerate the flaws. Many people argue that this amount of retouching is false advertising, and I can see their argument, but Gry must be doing something right judging by her list of clients which include Sony, Universal, and Ben Sherman, just to name a few. She sells a two disc DVD series full of beauty retouching tutorials on her website. She also offers Photoshop training for people living in (or willing to travel to) London or Spain.