GPT Image提示词：

A sunlit retro-futurist metropolis floats above a tranquil cloud layer, viewed from a broad elevated terrace. Elegant stepped towers combine streamlined 1920s-inspired geometry, carved fan motifs, and clean modern glass, with rooftop parks, flowering vines, and slender water channels connecting the buildings. Several luminous koi-shaped holograms glide through the open air above a reflecting pool, their translucent fins scattering small flecks of colored light. Tiny adult residents stroll along a garden bridge, included only to establish scale. Frame the city with a strong central avenue leading toward distant towers, balanced by crisp foreground leaves and patterned stonework. Clear midday sunlight creates precise shadows and bright reflections; the sky is vivid but natural. Optimistic speculative architecture, refined decorative detail, lively greens, coral and turquoise accents, cinematic wide composition, realistic materials, sharp focus, high-resolution environmental concept art.

中文提示词：

一座復古未來風格的陽光城市漂浮在寧靜雲層之上，視角取自寬闊的高處露台。優雅的階梯式高樓融合二十年代裝飾藝術幾何、扇形雕刻圖案與簡潔現代玻璃，屋頂公園、攀花藤蔓和纖細水道將建築彼此串連。幾條發光的錦鯉全息影像游過開闊空間，半透明魚鰭在倒影池上方散落細小彩光。少數成年居民漫步花園橋上，只用來呈現城市尺度。構圖以一條明確的中央大道引向遠方樓群，前景安排清晰的葉片與有紋樣的石鋪地面。晴朗正午陽光投下俐落陰影，映出明亮倒影；天空鮮明而自然。樂觀的想像建築、精緻裝飾細節、鮮活綠色搭配珊瑚色與青綠點綴、電影感廣角構圖、材質真實、焦點清晰、高解析度環境概念插畫。

说明：高樓、花園與錦鯉全息影像共同構成明亮的漂浮城市景觀。