as the other girls said, do your eyeliner first-liquid or pencil- because if you try to do it on top of your mascara, it could smudge the mascara too! what i do is take a pencil that is pretty dull so it will move easier, and stick the tip in between my fingers or a piece of toilet paper. this warms the pencil up so it will glide onto your eye easier and with a darker color. then, starting on the bottom, right up close to the lashes, move towards the outside of your eye. then, go to the top and start at the inside lashes and move out. connect the two lines at the outside corner of your eye.
if the look is too strong for you, take a q-tip and lightly go over it to soften the look.
lastly, try brown eyeliner if you have blue eyes---it makes ur eye color pop out!!
good luck<3