高端极简扁平矢量旅行海报，[CITY_NAME]，3:4 竖版构图。

Premium minimal flat-vector travel poster for [CITY_NAME], 3:4 vertical.

Create an airy, elegant city scene with large typography-safe negative space in the upper-left.
Add “[CITY_NAME]” and one short refined English caption that matches the city mood.

Automatically adapt the illustration to [CITY_NAME]:
include one iconic primary landmark, local architecture, café culture, a transport sign, street lamps, flowers, trees, small city details, and calm daily-life moments.

Use only 3–6 people, naturally interacting with the city:
talking at a café, walking, jogging, sketching, or taking photos.
Avoid crowds, avoid a single hero character, and keep the composition open and uncluttered.

Style:
Japanese stationery aesthetic, luxury sticker illustration, premium commercial flat-vector poster, clean thin outlines, consistent line weight, flat colors only.

Palette:
pale powder blue, soft sky blue, mist blue as the dominant background tones;
warm cream, soft beige, sage green, muted gray-green for architecture and nature;
dusty rose or blush pink only as tiny accents on flowers, signs, awnings, or small decorative details.

Mood:
fresh, minimal, elegant, calm, refined, high-end travel postcard and lifestyle branding.

No realism, no watercolor, no painterly effects, no photorealism, no shading, no gradients, no texture, no dense background.