Art style: 3D stylized animation.
A misty forest at twilight. Two small girls, one crystalline and one coal-skinned, stand before a small wooden shed with a circular window. A stone castle wall is visible in the distance behind the trees. The crystalline girl holds a glowing red key. The sky is a pale purple and orange.
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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 "3D stylized animation" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "3D stylized animation". 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 "3D stylized animation" idiom, not in any other medium.
