Art style: Children's Book.
A 5-year-old boy with messy, sun-kissed blonde hair and bright, mischievous blue eyes. He has a round, energetic face and a gap-toothed grin. He wears a bright red and blue striped t-shirt and denim overalls with a small grass stain on one knee. His energy is vibrant and chaotic, contrasting with his sister's stillness. He is often seen with a toy car in hand, surrounded by colorful plastic blocks.
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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.
