Create a visually compelling cloud city walkway scene for a book cover illustration. Cinematic style, {{mood}} atmosphere. Use aurora borealis lighting with {{color_palette}} colors. Composition: elevated overlook with detailed foreground, grand walkway mid-ground, and floating structures in the background. Include glowing vegetation, soft mist, and floating motes. Night sky with aurora. Ultra-high resolution, sharp, no artifacts. Wide angle, deep depth of field. Avoid repetitive patterns, tiling, inconsistent perspective, scale errors, text, or watermarks. Use --ar {{aspect_ratio}}.