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Retro travel poster illustration with limited flat color palette
Vintage travel poster illustration for destination_name, mid-century modern flat illustration style similar to 1960s airline posters, limited palette of four flat colors (color_palette), bold simplified shapes for landmarks and landscape, strong sun or moon as a graphic focal element, large clean negative space at the bottom reserved for a headline, subtle paper grain texture overlay, confident thick outlines, no gradients except in the sky, nostalgic optimistic mood --ar 2:3 --style raw --v 6
Negative prompt: no photographic realism, no more than four colors, no clutter, no modern typography rendered by the model, no drop shadows, no 3D shading