1. Keep the Color on the Top Lid Only
You don't want to outline your entire line with blue liner, or it'll look too intense.
2. Use Black Liner, Too
Instead of just using blue liner, you can start by using a black liner close to your lids and then use some blue up above it.
3. Highlight Your Tearducts
you use a light, sparkly aquamarine liner, then you can put it by your tearducts to act as a highlighter.
4. Press Lightly on the Lower Lash Line
If you're dying to place some liner on your lower lash line, then you can. Just don't make it look heavy.
5. Wear False Lashes
You can make your eyes look even more intense by wearing them with long false lashes.
6. Use Grey on Your Waterline
You should use a "grey pencil liner along the waterline for balance."
7. Only Line a Third of Your Eyes
Instead of placing your liner all around your eyes, simple "line the upper and lower lash lines about a third of the way across with blue eyeliner."