I Love Eyeliner

Ever since i can remember I've been obsessed with eyeliner. My favorite color of course is black, Black, BLACK! The darker, the thicker, liquid, it didn't matter. But there's always been a debate about who should wear eyeliner and how you should wear it according to your eye shape. I go back and forth with if i should wear it on the waterline, or underneath the lashes because of course i want my eyes to appear bigger and brighter. I believe you really have to take pictures to see which style really suits you but it's also about mood. What do you think?