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The Shape of the Eyes
note how the rounded shape of the eyeball means that the angle of the head means that the shapes formed by the eyelids appear different. Careful observation is key.
We often draw the eyes as symmetrical ovals, and think of them as being mirror images of each other. But as you know, the human face is not symmetrical, nor is the eye itself. Eye shapes vary a great deal, and the shape of the lids will change as the eye moves. When gazing to one side, they can change dramatically. Add a slight turn of the head or move your viewpoint from the center, and the eyes can look very different indeed. Trust your observation and use the position of the pupils as a reference point.
More on Eyes and Portraits
Using Your Eyes.. and Drawing Eyes