Isometric 3D Miniature City Diorama with Holiday Theme

A detailed prompt for Nano Banana Pro to generate a clear, 45-degree isometric 3D miniature cartoon scene of a classic city landmark. The scene is decorated with holiday elements, lights, and seasonal details corresponding to a specified festival, all set on a small, neat diorama base with bold text overlays.

Prompt

Present a clear, 45° top-down isometric 3D miniature cartoon scene, depicting the classic architecture or landmarks of [{argument name="city" default="Shanghai"}] and placing it at the center of the composition.
Use decorations, twinkling lights, and appropriate seasonal details (defaulting to Winter) corresponding to the [{argument name="holiday" default="New Year's Day"}] to depict the city as a [{argument name="holiday" default="New Year's Day"}] theme filled with festive atmosphere.
Use soft and delicate textures, realistic PBR materials, and soft, realistic lighting, creating subtle shadow effects.
Create a small, neat diorama-style city base with clean edges.
Use a clean [{argument name="holiday" default="New Year's Day"}] background color that contrasts sharply with the scene.
In the top center, display the text [{argument name="city" default="Shanghai"}] in bold, large font.
Immediately below it, display “[{argument name="holiday" default="New Year's Day"}] Special Edition” in medium font.
(Optional) Place a small square flag icon below the text.
All text must automatically match the background contrast (white or black).
Composition: Perfectly centered, 1080×1080 square, ultra-minimalist holiday diorama aesthetic