Art style: Children's Book.
A deep, sapphire-blue gaseous environment with thick, churning clouds of methane. Millions of small, sparkling, translucent diamond crystals are falling through the atmosphere like hail. The lighting is dark and moody with faint luminescence from the crystals. The composition is a vertical downward-looking shot into the endless blue abyss. Teal and obsidian tones create a cold, pressurized atmosphere.
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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.
