Create a medium-shot vertical fantasy underwater portrait of [Subject] in deep, crystal-clear water. Around her, show a group of [Companion Fish] swimming everywhere through the scene. Place several fish close to the camera so they create a subtle three-dimensional near-lens effect, while more fish drift softly in the background. The mermaid wears a gentle smile and reaches one hand toward the fish with a calm, graceful gesture. Sunlight passes through the water surface and casts lively caustic patterns across her skin and mermaid tail. Make [Hair Detail] especially luminous in the morning light. Preserve a clean photoreal underwater fantasy style with transparent water, soft aquatic haze, natural floating motion, delicate skin texture, shimmering scales, elegant composition, and a vertical 9:16 aspect ratio. Keep the subject adult-presenting. Avoid readable text, logos, extra watermarks, distorted anatomy, malformed hands, broken fish shapes, murky water, harsh noise, low resolution, and flat lighting.