Create an original, production-quality image-generation prompt for this brief: create an original double-exposure travel poster using a supplied subject reference without copying any existing poster. Inputs: {{subject_reference}}, {{destination}}, {{landmarks}}, {{era_or_style}}, {{aspect_ratio}}. Define the focal subject, environment, composition, camera or illustration perspective, lighting, material behavior, depth, color mood, and negative space. Preserve exact product, architecture, logo, packaging, UI, or person-reference details when supplied; do not redesign them unless asked. Produce a recognizable profile silhouette blended with destination elements, controlled color palette, poster grain, legible destination title space, and balanced negative space. The final visual should look intentional at advertising or editorial quality, not like generic AI art. Avoid distorted anatomy, duplicate objects, fake text, clutter, plastic skin, inconsistent reflections, impossible structure, and excessive effects. If copy will be added later, keep a clean text-safe zone and do not render small body copy into the image.