I have really light skin and eyes, so can't go too obvious on eyeliner. But I have really dark hair, which benefits from some eyeliner. What works for me best - after trying a lot of types... is to have a very thin brush and use very dark cool brown powder eyeshadow. I put a drop of water on the shadow, swirl it around and then very carefully just touch the brush to the top of my lashes where they meet the skin.. and do that across the eye. I let the weight of the water kind of set the line.. you don't really see it above the lash line, it just flows kind of around your lashes (doesn't get in my eyes) and deposits the pigment. And dries very fast.
So that's it for me, *watercoloring* is what works.