There are a couple choices that you have if you have a mono lid. You can draw a crease in. So you can take a brush, a fluffy makeup brush or a little eye shadow brush, dip it in your favorite color, and just sketch the crease in so it creates the illusion that you have a crease even if you don't.
The other thing you can do if you don't want to do that, is gradient the color from dark into light. So in other words, take the darkest eye shadow color you want to use along eyelash line, and then do a medium tone in the middle and then a light tone up near the eyebrow. So it creates sort of a rainbow effect from dark into light. And it works really well with mono lids and helps your eye look bigger.
Those are two choices that you have for Asians who have a mono lid and want to know how to best use your eye makeup.