In an article about makeup for TV in the Washington Post, there's an interesting section about doing makeup for high definition TV:
With HDTV, Making Up Is Harder to Do
The advent of high-definition television means makeup magicians must pay more attention to detail than ever before.
"When you do regular TV, you can get away with a lot more," said "Blade" makeup artist Cindy Barlow. "When I do high-definition shows, I treat it as a feature film, which means when I look into the mirror at an actor, that's what the camera will see."
"CSI's" Matthew Mungle thinks HDTV will force the industry to produce better artists. "You'll have to watch what you do more, watch how much paint and makeup you use, and be more artistic," he said.
In fact, HDTV often lets you see more than what you'd see in the mirror - taking images beyond what the human eye can naturally see in real life.