If you're wearing a dark brown eyeliner

• You can enhance it with a bronze;
• with a deep mahogany brown;
• any other type of brown color.

If you're wearing black eyeliner

• you can even try and enhance that with a slate steel gray;
• Or even dark navy blue.

Or like with my model in the video above, she has on a gorgeous purple eyeliner. We enhanced that with a plum shadow.  Now, this purple shadow just automatically enhance the eyeliner that was already there. By simply applying the eye shadow right over the eyeliner, you're not only enhancing the longevity of your eyeliner, but you're giving a really beautifully smoky look to the face.