Naomi's face, Tyra's hair. If you're going to fake it, do it right.

Ladies:
Visible lipliner. We know where your lips are thank you very much.
MAC. Not really a fashion no-no, but most gung-ho MAC fans take it too far. There's no need to spackle it on.
Terribly bad weave/wigs. You're not fooling anyone with that snarled patch of doll hair.
Make-up so thick you could leave a finger print in it.
Wearing every single current fashion trend in one go.

Gents:
Hoodwear. It's so played out. Your tshirt should not look like a shapeless dress. Stylish, well fitting clothing will never go out of style.
Scruffy, scragly face hair on otherwise groomed men.