How can line change facial expression?

By changing eyebrow and mouth lines

Lines are important tools for showing emotion in a portrait. The direction, curve, thickness, and position of an eyebrow or mouth line can make the face appear happy, sad, worried, surprised, angry, or calm. Even a small change in these lines alters the relationships between the facial features, so the viewer reads a different expression.

For example, an upward-curving mouth can suggest happiness, while a downward curve may suggest sadness. Raised or angled eyebrows can show surprise or concern, whereas lowered, sharply angled eyebrows may suggest anger. Therefore, changing eyebrow and mouth lines is the correct choice, so option A is correct. Paper price, brush length, or hiding the picture does not directly change the drawn facial expression.

This is a Class 9 Art Education question. Chapter: Portrait Drawing. Topic: Facial Expressions.