Here are a few techniques & products for creating a strong and sexy eye liner.
I like liquid liners like Smashbox Limitless Liquid liner Pen.
It's quite easy because it does work just like a pen. You just sweep it on in the shape that you want.
I also like cake liners like Joe Blasco's cake eyeliner. You wet a brush (I prefer a thin angle brush but you can use any eyeliner brush) and roll it back and forth through the cake liner. For a thin line apply a light pressure with the tip of the brush. For a thicker line apply more pressure.