Elderly Chiaroscuro Portrait Prompt

Create a centred frontal fine-art portrait, vertical 4:5, of an elderly man with swept-back silver hair and weathered facial features, facing the camera with a calm expression beneath pronounced forehead lines and pale blue eyes. Cut a narrow warm beam of directional sunlight horizontally across his eyes and upper cheeks, producing stark chiaroscuro as the lower face and black ribbed turtleneck recede into shadow. Resolve fine skin pores, stubble, wrinkles and individual flyaway hairs sharply, against a nearly black navy background that absorbs stray light and isolates the subject. Crop tightly from the chest upward, with symmetrical framing, subdued earth tones and a solemn editorial atmosphere.