Photorealistic nature landscape photography of aurora borealis over an icy glacial lagoon at night, emerald and violet curtains reflected in still dark water, blue floating ice fragments in the foreground and distant snow-covered mountains under a clear star field. Vertical 3:4 composition with sharp foreground ice texture, calm water reflection, readable mountain silhouettes and natural long-exposure glow. Realistic polar travel photography mood, dramatic but believable color, no people, no buildings, no animals, no readable text, no watermark, no fantasy effects.