Answer:
The answer is "five eyes fit across the average adult’s head".
Exclamation:
When you have the eyes set up, you can measure the width of the head. It's five eyes over.
Obviously, there is a ton of variety in human appearances, and some will be more extensive, some will be smaller than this. However, the "5 eyes wide" control is a decent place to begin.
The distance between the eyes is an indistinguishable size from an eye. You should have the capacity to fit 5 eyes over the head so utilize your pencil as an estimating guide.
You place the eyes when drawing a portrait like this;
One between the two eyes, the one between your right eye and right ear and one in the middle of your left eye and left ear.