Practice… preferably using less expensive makeup. Watch lots of videos. See what works best with both your eye color (get a color wheel, colors opposite to your eye color will make your eyes pop more), and your eye shape (hooded eyes have different techniques than deep set eyes, or any others). Nearly everything you want to know can be found on you tube through careful searching. You can print a color wheel from the web for nearly free. They’re useful for doing makeup. What I was doing at first was really wrong for the shape of my eyes as well as their color (blue if your curious, and hooded).