Sometimes a little retouching makes a good image really pop!
Some retouching can really enhance and give a glamourous feel to an image if this is desired. Visually enhanced to look better than your best.
As a rule I do little, if any retouching. Although like all things in art - rules are made, understood and then often broken.
I recommend not too much, which often leaves the viewer unsure if the image has been retouched at all: "Maybe she does have perfect skin".