Ключевые слова: adult, background, calm, chin, concentration, contemplation, deep, dynamic, emotion, expression, face, focus, gaze, green, hands, introspection, introspective, isolated, male, man, mature, meditation, mental, one, peaceful, pensive, pondering, portrait, quiet, reflection, reflective, serene, serious, single, solitude, thinking, thoughtful, thoughtfulness, tranquil,