Chibi Hero Opens a Treasure Chest on Adventure Island

Create a finished flat 2D design that fills the entire canvas, aspect ratio --ar 16:9. Scene elements inside the artwork (walls, rooms, shadows and so on) are allowed when the description calls for them, but absolutely no photo-of-a-poster mockups: no picture frame, no poster on a wall or desk, no photo pinned up, no perspective warp on paper edges, no drop shadow around the artwork. [Campaign Details] - Title: [game title: Treasure Hunt!] - Tagline: [description: Find treasures on a great adventure island!] - Genre line: [subtext: RPG Adventure Action!] [Look and Content] Think of the event-announcement art for a Japanese mobile RPG or casual game: a cheerful, colorful fantasy world. In the foreground, adorable chibi heroes or mascots grin as they lift the lid of a treasure chest, and golden light with magical particles bursts out dazzlingly. Behind them spread a blue sky, white clouds and lush fantasy islands or forests. Put a fantasy-style decorative logotype of [game title: Treasure Hunt!] at the top or in the center (works for GPT-image / Nano Banana Pro), and lay out [description: Find treasures on a great adventure island!] and [subtext: RPG Adventure Action!] beneath it so they read easily. Colors are bright and highly saturated, with magical gloss and soft shadows.