The distance between the eyes is usually the width of one eye. The Five-Eye Rule: The head is typically five "eyes" wide.
The human face follows surprisingly consistent mathematical rules. Secrets to Drawing Realistic Faces
What is your (beginner or intermediate)? Are you working with pencil, charcoal, or digital tools? The distance between the eyes is usually the
Use a kneaded eraser to "pull" light back out of dark areas for a glow. Secrets to Drawing Realistic Faces
The top lip is usually darker because it tilts away from overhead light.
The corners of the mouth generally line up with the centers of the pupils. Focus on Value, Not Lines