Art style: Children's Book.
Yermak Timofeyevich, the legendary Cossack ataman, shown full-length from head to feet, standing upright and centered — a broad, powerfully built man in his forties with a weathered, sun-and-frost-worn face, sharp grey eyes, a strong straight nose and high cheekbones. He has a full dark brown beard streaked with grey and thick brows. He wears a heavy iron chainmail hauberk over a deep-red woolen kaftan belted with a wide leather sash, a fur-trimmed cloak across broad shoulders, and a tall dark fur hat. A curved sabre hangs at his left hip and a flintlock pistol is tucked in his belt; one gloved hand rests on the sabre's hilt while the other grips a burning torch. Sturdy tall leather boots. Behind him, a dark snow-swept taiga forest with drifting snow, resolute 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.
