Art style: Oil Painting.
Leonardo da Vinci, shown full-length from head to feet, standing upright — the entire figure centered in frame, an elderly Renaissance polymath in his sixties. He has a long flowing silver-grey beard reaching his chest, a high balding forehead with long wavy grey hair falling to his shoulders, deep-set thoughtful eyes, a strong straight nose and weathered fair skin lined with age. Sturdy medium build. He wears a long crimson-rose woolen robe (giornea) over a dark tunic, a soft draped cap, and a leather belt holding a sketchbook and metal stylus. Ink-stained fingers. On his feet, worn brown leather flat shoes. He stands in a candlelit workshop cluttered with anatomical drawings, gears, a flying-machine model and glass flasks, holding a quill, gazing outward with calm, penetrating curiosity.
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FINAL STYLE ENFORCEMENT (this is the authoritative rendering directive — it overrides any style wording elsewhere in the prompt):
Render this image entirely in "Oil Painting" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "Oil Painting". 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 "Oil Painting" idiom, not in any other medium.
