Empty beach at sunset

1. No people, including distant silhouettes.
2. No birds, including specks in the sky and gulls at the waterline.
3. No boats, including sails on the horizon.
4. No footprints. Smooth sand or wind ripples only.
5. The Outer Banks. Dunes with sea oats, a wide flat beach, Atlantic surf. A lighthouse or a wooden dune crossover is a plausible extra.
6. Where the sun sets. The Outer Banks' ocean beaches face east, so the sun does not set over the Atlantic surf there. A sunset behind the dunes, or over the calm water of the sound, is correct; a sun sinking into ocean waves is a geography miss. Score axis 6 separately from 1–4.

On the models. Nano Banana 2.1 and Nano Banana 2 emit image and text and run as ordinary chat models; Seedream and the Flux models emit only an image and go through OpenRouter's images endpoint. Nano Banana 2.1 thinks at minimal effort by default; a round run at high is a separate round and says so in its batch label.