This tutorial works best using liquid, cream, or gel liners. This is just one of the ways I like to apply my winged eyeliner and of course, there is no right or wrong way to do it. I'm using MAC Blacktrack Fluidline with my Sonia Kashuk eyeliner brush. I also like using L'Oreal Lineur Intense Felt Tip Liquid Eyeliner.
I recommend using an eyeliner brush rather than an angled or flat brush because it's similar to a pen allowing more control for. Use whatever you're most comfortable with and follow these steps. :)