Create a premium 2×2 four-panel travel poster collage using the four provided reference images. Keep each poster’s original design, typography, colors, landmarks, text, coordinates, and vintage aesthetic intact.
Arrange the four posters in a perfectly aligned 2×2 grid:
Top-left...
该提示词需要添加参考图 —— 上传你的图片效果更佳（可选，不加也能生成）。 