The best way to draw anything is to either have the item that you are drawing in front of you or a picture of that item. Drawing from memory is quite difficult. Plus, it may be inaccurate. Eyes have different shapes depending on the person or thing. Look at the shape of the eye first. Draw that shape. If it is a human being’s eyes, they are usually slightly oval shaped. Then draw a circular shape inside the first shapes.
This part should be a certain color or shaded. The pupil is the small dark circle in the very center of the eye. Also, the eyes have blood vessels in them. Some eyes have very noticeable blood vessels whereas others do not.
