Art style: Cinematic Realistic. Full-length view, the entire figure visible from head to feet, standing upright, centered in a math classroom. A strict male mathematics teacher in his late fifties, tall and lean with slightly stooped shoulders. Angular pale face, deep forehead creases, sharp cheekbones, thin lips pressed into a stern flat line, cold grey eyes behind rimless rectangular glasses. Neatly combed short grey hair, thinning at the temples, with a trimmed grey moustache. He wears a dark charcoal tweed blazer over a pale blue button-up shirt, a narrow burgundy tie, brown belt, pressed grey trousers, and polished black leather lace-up shoes. In one hand he holds a red marker; a stack of graded test papers rests under his other arm. Behind him a green chalkboard covered in equations, wooden desks and tall windows with afternoon light. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FINAL STYLE ENFORCEMENT (this is the authoritative rendering directive — it overrides any style wording elsewhere in the prompt): Render this image entirely in "Cinematic Realistic" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "Cinematic Realistic". Keep the subject, composition, camera angle, lighting direction, and colour palette from the description above — but EVERY surface, skin, fabric, material, and environmental element must be rendered in the "Cinematic Realistic" idiom, not in any other medium.
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