Don't Believe What Magazine Covers Tell You

This site shows just how much a photograph can be retouched to make a “natural-looking” model look like an unreal super-model. Remember that next time you see a celebrity looking flawless, they probably don’t actually look like that…

Model before & after retouching

So you want to look better than life too? This site lists several tutorials for retouching photographs:

Photo-retouching tutorials