This is another technique I learned from Chicago-based retoucher David Cuerdon. David uses this technique in fashion and glamour photography to give skin a smooth, silky feel.
Open the photo that you want to give the glamour skin-softening effect and duplicate the Background layer. The quickest way to duplicate a layer is to press Command-J (PC: Control-J).
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Go under the Filter menu, under Blur, and choose Gaussian Blur. When the dialog appears, enter between 3 and 6 pixels of blur (depending on how soft you want the skin), to put a blur over the entire photo. ...