Before and After examples of appropriate retouching for a headshot. The retouching should be natural and should be done to remove any distractions and small blemishes.
Its easy to get carried away and do too much retouching. Good retouching is to know when to stop. In the above example we cleaned up a few distracting fly aways (hair), cleaned up under the eyes a little.
headshotcafe.com 
A seemingly small change, but it makes a big difference! Nice!
Thanks Nate
She’s so pretty!
Fantastic! Thanks for spot lighting my photography and retouching.
“Good retouching is to know when to stop.” << well said.