One-Day City Timeline Collage Poster

Create a vertical city timeline collage poster for [CITY]. Build a clean 3-column by 4-row grid with twelve coordinated image panels that follow one day in the same city, from sunrise through daytime, sunset, blue hour, and night. Each panel should show a different recognizable city scene such as skyline, landmark, waterfront, street life, transit, cultural space, park, historical district, market, bridge, or evening lights. Keep the city identity accurate and coherent; do not invent landmarks that conflict with the chosen city. Use realistic photography or cinematic editorial style, unified color grading, premium magazine-cover composition, and clear time progression across the twelve panels. Reserve one editable title area for [CITY] and an optional short subtitle, but avoid fixed text, unreadable labels, heavy black title blocks, watermarks, logos, excessive seals, or random tourism-poster clutter. The final image should feel like a polished cultural travel feature cover or city series key visual, not a messy screenshot collage.