Art style: Children's Book.
Full-length view, the entire figure visible from head to feet, standing upright, figure centered in a bright kindergarten gymnasium with soft foam mats, low benches and colorful hoops filling the sides. A friendly male physical-education instructor in his mid-thirties, warm approachable face with rounded cheeks, light tan skin, kind brown eyes, short neatly combed dark-brown hair and a small trimmed mustache, athletic medium build. He wears a fresh sporty gym outfit: a crisp white polo-style athletic T-shirt with a small whistle on a red cord around his neck, comfortable navy-blue track pants with a white side stripe, and clean white lace-up sneakers on his feet. He stands in a welcoming teaching pose, one hand raised palm-open as if explaining a rule, the other resting on his hip, smiling encouragingly. Cheerful, calm, patient expression.
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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 "Children's Book" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "Children's Book". 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 "Children's Book" idiom, not in any other medium.
