Question: How to easily capture the shape of a human eye on a drawing?
Options:
Draw two overlapping circles big and distant enough so that the overlapping region makes the shape of the eye as per desired size of the drawing.
Take a wooden carving of an eye, color the edges of it and press it against the drawing paper to imprint the outline on to the paper.
Answer: Draw two overlapping circles big and distant enough so that the overlapping region makes the shape of the eye as per desired size of the drawing.