Here it is, from start to finish.
Adobe Lightroom for global adjustment to the image (WB, Exposure etc) then off to Photoshop CS5 for the more specific work.
-Added some noise in the smoothed areas to simulate normal skin texture
-B&W Gradient layer to enhance contrast
-Dodge & Burn layer
-Sharpening with a High Pass layer
I didn't shoot this image so I had to pay some special attention to lifting the dark areas under the chin. My usual setup includes a silver or white reflector under the chin to bounce light for fill in that area in addition to the main light.