Draw the black ring that makes the iris of the eye. It is a full circle, but the top and bottom are normally hidden beneath the lid.
Draw the pupil in the center of the iris.
Add a shape that sits on the iris and pupil simotaneously to represent a glare if light. Leave this white, but color the pupil in black.
Draw the rim of the bottom lid beneath the bottom of the eye (very thin). Draw small lashes coming from the lash line.
Red, orange, yellow,
green, blue & purple.
Outside the eye, doodle in rainbow order.