I wish all magazine covers were forced by law to print a disclaimer on the front:
"Please be advised: Cover model enhanced with studio lighting, photoshop, airbrushing, etc, as well as a pound of make-up. Model did not wake up this morning (or any other morning for that matter) looking as shown on cover photo." :)
Here are two excellent videos showing the difference between what models look like in real life and what they look like in commercial photos. The first one, by Dove cosmetics, is particularly good because it's about both makeup and photoshopping. The second one focuses on photoshopping -- one of several on YouTube like it.
[youtube=425,350]http://www.youtube.com/watch?v=OXf8fr0Kp3Q[/youtube]
[youtube=425,350]http://www.youtube.com/watch?v=P4wI_o8gyxA[/youtube]