We've been trying to do the perfect "rebellious eyeliner with a little 50's twist" look a la Sasha P in the Prada ad and it just comes out amatuer on us. Pat McGrath makes it look so easy but it's really not. It's almost easier to just buy the stupid Prada bag she's advertising than paint the cat eye. It's really frustrating but we'll keep trying.
Here's the Pat McGrath liquid eyeliner tutorial: