Art style: Children's Book.
Full-length view, the entire figure visible from head to feet, standing upright, figure centered — Danil, a cheerful, friendly 7-year-old boy with a lively spark in his bright hazel eyes and a wide mischievous gap-toothed grin, rosy cheeks and light fair skin. He has tousled short light-brown hair with a small cowlick at the crown. Slim, small-boy build, upbeat and energetic. He wears a cozy long-sleeve striped blue-and-white shirt, comfy dark-blue jeans, and colorful red-and-white sneakers with untied laces. One hand is raised in a happy wave, the other holds a small Lego brick, weight on one foot in a playful lean. Behind him a warm cozy living room with a birthday table, a frosted cake with lit candles, balloons and streamers, soft daylight from a window.
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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.
