Art style: Watercolor. Full-length view, the entire figure visible from head to feet, standing upright, figure centered in a bright university lecture hall with tall windows and a chalkboard filling the sides behind him. A warm, approachable male professor in his late fifties, average height with a slightly stooped, slender build. He has a kind, lined face with high cheekbones, fair skin, gentle grey-blue eyes behind thin round wire-rimmed glasses, and short greying hair with a neatly trimmed salt-and-pepper beard. He wears a soft brown tweed jacket with elbow patches over a pale blue shirt, a loosened knitted burgundy tie, dark grey corduroy trousers, and scuffed brown leather brogues. He stands relaxed, one hand holding a piece of chalk, the other tucked in his pocket, offering a warm, encouraging smile. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FINAL STYLE ENFORCEMENT (this is the authoritative rendering directive — it overrides any style wording elsewhere in the prompt): Render this image entirely in "Watercolor" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "Watercolor". 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 "Watercolor" idiom, not in any other medium.
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