Drawn with Art Set app on iPhone. When drawing an eye, always begin with the globe, or eyeball. Get it right. Shade it as you would a sphere. Then wrap and drape the eyelids over the ball, conforming to the shape of the rounded object. Do not forget to show the light reflecting off the inner part of the lower lid. Also, use a drop of red along the medial canthus. Shading can create a sense of depth, as the eye sits deeply within the orbit.
