Duplicate the base layer, then invert your selection and delete the background. Next, apply a Surface Blur to the top layer. Experiment with the amount to get a skin texture that suites the skin effect level you wish to achieve. Click OK and apply the filter.
Now apply a Layer Mask to the top layer in the set to reveal all. Next, hide sections of the image where the skin effect looks fake. Lips, eyes and hair are the usual suspects. Take care and remember you’re not just deleting parts of this mask to alter it. Don’t be afraid to hide areas, as you can delete these from your mask and reinstate them later.
Duplicate the Background layer again, and desaturate this layer. Next, go to the Layer Effects and change to soft light with a setting of ten per cent. This will bring out little key details.