"I don't give a fuck" attitude. It is loosely tied in with rock and punk, but stands as it's own genre of music and style of dress. Instead of going out of their way to be the opposite of a "conformist", people with grunge style simply don't participate. They are generally the ones who play guitar, live for the music, let their hair get knotted, their clothes filthy and their attitudes nonchalant. They just don't care, they throw on whatever.
Beyond that don't focus on "perfecting a hair look." Instead throw it up in a bun or pony tail or leave it down with its natural kinks. Don't worry about frizz or matting.
Makeup should be a mix of natural and bold. Using some makeup can augment a grunge look, but generally you won't want to use too much or spend too much time on it. Try using some bright red lipstick without any foundation, or do up your eyes with dark shades and leave your lips natural.
Products used:
♥ NYX Eyeshadow Base (ESB03)
♥ UD NAKED 3 (Strange, Limit, Nooner, Darkside)
♥ L. A. Colors Eye pencil
♥ Elf Cosmetics 3 in 1 Mascara (Very Black #30226)
♥ Incing Expert.Lips (More Wine, Less Whine)