New Sky

Replace the sky in this photo with a clear blue sky featuring light natural clouds. Keep the horizon line exactly in place. Update water/glass reflections subtly to match new sky. Preserve photographic grain — no smooth gradient skies, realistic cloud irregularity.

Everything else stays pixel-identical: architecture, people, vehicles, ground, composition, camera angle, aspect ratio, color grading of non-sky elements.

If no sky is visible in the input (tight close-up, interior, pure facade), return the input unchanged. If the sky is already clear blue, return the input unchanged.