Subject: Shanghai city skyline buildings, modern cross-river bridge, sparkling water surface, tulip branches, blooming fireworks and soft clouds. Scene: Prosperous city riverside, festive holiday celebration scene. Style: Flat trend illustration, modern simple urban festival painting style. Tone: Dominated by blue line outlines, with orange-red accents, pink gradient sky, bright and warm. Lighting: Soft even diffused light, bright and festive atmosphere, clean and soft lighting. Composition: Foreground bridge and water scenery set off, middle ground city landmarks centered, background sky with embellished elements, full and harmonious composition. Use: Shanghai city holiday celebration poster, urban cultural tourism festive promotion, city celebration event visual material, text-free festive illustration.