There are photo tweaks, and there are touch-ups, the latter having almost no limits in the digital world we live in. Glenn Feron is a master, and the results are stunning - so much so that you realize some of the famous people you think are beautiful are more normal looking thank you'd think. This site is definitely work a look to see how far a digital artist can push/pull reality.
WARNING: There are no nude images, but not all may be office/family friendly.