1. MISMATCHED FACE AND NECK
Foundation is all about consistency—so you ruin the illusion of flawlessness when you forget to match your face to your neck. To avoid looking like you're wearing a mask, blend your foundation down to your décolletage.
2. DERRIÈRE-LENGTH HAIR
Long hair is sexy, but can be (way) too much of a good thing. To your bra strap is good. To your butt is just too much.
(See more: 5 fast beauty fixes under $6 )
3. FRENCH MANICURES AND PEDICURES
Sorry, French mani lovers: If you wore it to prom, it's time for an update.
4. VISIBLE LIP LINER
There's nothing polished about sharing your routine with, and on, those around you. Please, keep the nail clipping and hair brushing behind closed doors—or at least to the ladies' room.
6. BRONZER BONANZA
Bronzer should make skin appear sun-warmed—not sun-wrecked. Add just enough for a believable glow.
7. CRAGGY MANICURES
The off-duty model look has found popularity with young designers like Alexander Wang. But there's a difference between hip and chipped. A totaled manicure belongs to the second category. Take it off and buff if you don't have time to repaint.