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Create a graphic editorial studio portrait set against a seamless sand-colored backdrop with one clean diagonal shadow shape. Show an entirely fictional adult wearing a structured plain black jacket, standing straight with shoulders angled slightly away, chin level, one hand in a trouser pocket and the other hand completely visible at the side. Compose a vertical knee-up frame with a 50mm lens look, camera at chest height, orderly geometry, and enough margin around the body. Use one controlled hard key light through a simple flag to cast the diagonal background shadow, plus minimal frontal fill so facial features remain readable and skin color stays accurate. Do not imitate a real magazine cover, photographer, celebrity, or public figure; no duplicate shadows, warped pocket hand, extra fingers, readable text, logos, watermarks, borders, or visible light equipment.