nano-banana Scene Concept Art: Worldbuilding Atmosphere Exploration

A scene concept art exercise for worldbuilding: use a natural-language description to drive nano-banana to generate an environment image with clear spatial layering and lighting logic, and pair it with a reference image to constrain the forms of architecture and terrain, so that "different corners of the same world" remain visually coherent. The composition has two layers: the reference image provides the baseline silhouette, materials, and color tone of the main city (stone structures, cantilevered bridges, light sources in the mist), while the prompt describes camera position, shot size, light direction, and atmospheric effects, turning the reference image into a reusable scene mood piece. The base fixes a 16:9 vertical composition ratio and 2K resolution, outputting JPEG for direct use in storyboards or pitch decks. Use cases: early-stage worldbuilding exploration for games and film, batch trial-and-error of scene mood pieces, generation of derivative images that must stay consistent with existing character/building designs, and upgrading sketches or old reference images into more polished concept art.