How many “eyes” fit across the average adult’s head? Where would you place the eyes when drawing a portrait?

Five segments equal to the size of the eye would go across a person's head. One on each side of the actual eye and one in the middle. The eyes go about halfway down the head.

Example (not my drawing btw):

hard bop is an extension of bebop that was kind of interrupted by the cool sounds of west coast jazz. it experienced its revival in the 1990’s.