You Can't Let Your Roots Show

Grown-out roots are another trend that can turn out bad, if done incorrectly. Madonna's sleek blonde 'do and dark roots are the perfect of example of how to pull off the look without appearing sloppy. "A little bit of root gives great depth to color and is also becoming much more common with the ombré trend," Potempa says. "To get rid of the 'color line' between your roots and color, avoid getting solid colors and be sure to get a mix of tones in your hair so the roots blend with the overall color when it grows out."

You Have To Match Your Brows To Your Hair Color

Depending on how drastic the color is, just because you decide to dye your hair, doesn't mean you have to dye your eyebrows too. When Emma Stone went back to (her natural) blonde, she kept her eyebrows a soft, honey brown, which looked amazing. If you feel the need to tweak your eyebrow color just a bit, try shading it in with a pencil or powder so you can avoid the maintenance of a regular brow dye.

You Shouldn't Wear Bronzer If You're Already Tan

Even girls with tan skin want to have a glow! Lea Michele's bronzed cheeks look great on her olive skin, without looking fake. Kidd says to apply it in the hollow of the cheekbones and on the temples to add warmth and shape to the face. "You should never apply bronzer all over the face, as it will look like a mask: Use it to highlight features or add a subtle glow in key areas."

You Can't Wear Eyeliner Underneath Your Eye

Remember that pesky rule about keeping eyeliner on the tops of your lids, not underneath your eye, otherwise they'll appear smaller? Well, that is true. But, there is one way to get around it. "For the lower lash line, draw right on the edge of the rim--not on it, since that makes eyes look smaller," says Kidd. Also, try using a brown or taupe color to keep eyes looking soft and round like Nikki Reed.

Blush Goes On The Apples Of Your Cheeks

Wondering how Julianne Hough got her chiseled cheekbones? By contouring her blush instead of putting it on the apples. "I like to pump up the cheeks by adding brightness and color," Lucero says."If you are wearing a dramatic red lip, you can offset the cheeks by keeping the blush back above and behind the traditional apple area." Now, how about them apples?