Drawing a face has many variables, but there is a way to simplify it and get the basics set up so details can be added. Like any object, it can be dissected into shapes and sizes so it can look accurate and well-proportioned.
Here is an easy-to-follow, step by step tutorial for drawing a realistic female eye. You can use a normal pencil or graphite drawing pencils. Drawing eyes is not an easy thing to do, that's why I broke down the tutorial into 27 steps