Isometric 3D Miniature City Diorama with Holiday Theme

Present a clear, 45°-top-down isometric 3D miniature cartoon scene depicting a classic building or landmark of 【{argument name="city" default="Shanghai"}】, placed at the center of the composition. Use decorations, twinkling lights, and appropriate 【season, default winter】 or holiday details matching 【{argument name="holiday" default="New Year's Day"}】 to portray the city as full of festive atmosphere, themed around 【{argument name="holiday" default="New Year's Day"}】. Use soft, fine textures, realistic PBR materials, and soft realistic lighting, creating subtle shadow effects. Build a small, cleanly edged diorama-style city base. Use a clean 【{argument name="holiday" default="New Year's Day"}】 background color that contrasts sharply with the scene. At the top center, display the text 【{argument name="city" default="Shanghai"}】 in bold, large lettering. Directly below it, display "【{argument name="holiday" default="New Year's Day"}】 Special Issue" in a medium-sized font. (Optional) Place a small square national-flag icon below the text. All text must automatically match the background in contrast (white or black). Composition: Perfectly centered, 1080×1080 square, ultra-clean festive-diorama aesthetic