Japanese traditional dragon and koi back piece

Create a Japanese traditional irezumi tattoo design poster for a full back piece. Subject: a powerful coiling dragon above a koi fish leaping through stylized waves, maple leaves, wind bars, and storm clouds. Use traditional Japanese tattoo aesthetics: bold black linework, strong flat color blocks, deep indigo waves, red-orange maple leaves, emerald dragon scales, cream highlights, and rhythmic negative space. Present as a clean tattoo flash / back-piece layout on rice-paper texture, not on a real person. Include small calligraphy-style labels: "龍" and "鯉". Make the composition balanced, tattooable, dramatic, and respectful of classic irezumi design language. Avoid anime style, avoid modern cyberpunk, avoid random fake kanji clutter.