How to Smooth Skin using Quick Mask, Gaussian Blur and Noisedisclaimer: Use this at your own satisfaction. If you find this tutorial useful, feel free to distribute it to our fellow photographers, you can also donate on my paypal account accemm2000@yahoo.com 
Open the image you want to smoothen the skin
Duplicate the image
Reset your pallete
Enter quick mask mode
paint the area of the face leaving the eyes, eyebrows, nose and lips
after you painted the area, exit the quick mask mode
you should have a selection around the face
inverse the selection then feather of 10px
apply a gaussian blur of around 3px
add a little bit of noise around 2.5%, uniformed, monochromatic, to make the smoothing more natural
here's the images before and after
