Female anime eyes are usually rounder and wider than male anime eyes. The further apart you place the upper and lower eyelids, the wider the eye will be.
If you want the light source to be on the left in your drawing, draw the big circle on the left side of the iris and the small circle on the right. If the light is on the right, swap the circles. For lighting that’s above the eye, draw the big circle at the top of the iris and the small circle at the bottom. Do the opposite for lighting that’s below the eye.
Thick, distinct eyelashes are one of the defining characteristics of female anime eyes.
You can use colored pencil, crayon, marker, or even paint to fill in the iris.
If the light is to the left of the eye, draw the big circle on the left side of the iris and the small circle on the right. If the light is to the right, do the opposite. For lighting that’s above the eye, draw the big circle at the top of the iris and the small circle at the bottom. Swap the circles if the light is underneath the eye.
If you want to color in the iris, use colored pencil, crayon, marker, or paint.
The wider you make the eyes, the more surprised your character will look. Drawing the eyebrow high can also help the character look shocked/scared/surprised.
The steeper you make the slope, the angrier your anime character will look.