Art style: 3D vibrant cartoon animation.
A friendly green letter H with big blue eyes and a cheerful smile jumps inside a blue fabric-textured train car with yellow trim. The background features rolling green hills and trees under a bright, sunny sky. The lighting is warm and natural, creating a playful 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 "3D vibrant cartoon animation" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "3D vibrant cartoon 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 vibrant cartoon animation" idiom, not in any other medium.
