Here are a few simple tools:
For a defined, dramatic look, use black kohl liner—which smudges easily—to line the tops and bottoms of the eyes; whether or not the top liner should meet the bottom in the corners is a matter of eye shape.
So for close-set eyes, bring the lines together at the eyes’ outer corners. For wide-set, do the opposite: Close the inner corners, not the outer.
For bigger eyes, close both ends. Smudge the liner into the lash line and extend it a bit at the outer corners, but keep the smoky black hue close to the eyes.