I took this low key lit photograph in one of our studio lighting workshops. As well as desaturating the image and adding a screen layer with a gaussian blur, i also tried "air brushing" the subjects face. To do this i repeatedly selected parts of her face and "feathered" the selection, i then added a small gaussian blur to the selection. On the left is a close up of the image after i have attempted "air brushing" and on the right is before. The effect is subtle and unfortunately hard to notice in this small image.

Smoothing the subjects skin and erasing imperfections is a regular digital post production technique used by fashion and beauty magazines.