Real skin isn't perfectly smooth; it has pores, wrinkles, and imperfections.
The corners of the mouth generally line up with the centers of the pupils. Focus on Value, Not Lines Secrets to Drawing Realistic Faces
The top lip is usually darker because it tilts away from overhead light. Real skin isn't perfectly smooth; it has pores,
The bottom of the nose usually aligns with the bottom of the earlobes. Real skin isn't perfectly smooth