American Idol's Makeup Artist Gave Us an Inside Look at the Beauty Moments Backstage

Flawless-looking skin is always a challenge to achieve (partly because, frankly, it doesn't exist), but add high-definition cameras and close-up angles, and it becomes nearly impossible. The key isn't to use full-coverage products all over the face but instead apply lots of layers strategically.

"It's [about] building and putting things where they need to be," said Green. "I do a base and smooth things out, and then if I want to build my contour, I'll build where it needs to be. I always want to see a little bit of their skin coming through."