Spasm of m. corrugator supercilii under very strong light (left); A relaxed face (photographed in full sunshine) (right)

Attention

Face in repose

Dissatisfaction, somber thoughts (left); Reflection (right)

Expression of severity

Extreme pain, the head of Christ (left); Memory of love or ecstatic gaze (right)

Attention, attentive gaze (left); Painful attention (right)

Painful memories

A relaxed face (left); False joy or laughter (right)