Here's the Before and After. The technique is simple: in Photoshop (or Lightroom) work the image to produce the best exposure and contrast possible without torturing the pixels too much. Then create a Black and White Layer in Photoshop. Set that layer to "Soft Light" and then adjust the Layer Opacity to taste. For more control, paint in your mask on the B&W layer as I've done.
The "punch" created by this technique tends to be a little "crunchy"-- it can push skin tones towards porcelain white and etch wrinkles-- so it's really a matter of adjusting to taste.