A beautiful, realistic mermaid sitting gracefully inside a large open seashell. The mermaid has long, wavy brown hair, wearing delicate seashells as a top and decorative arm jewelry. Her tail is detailed with iridescent scales, fading from cream to orange and light blue, ending in elegant translucent fins. The seashell has a soft, pearlescent texture, resembling a giant clam. The scene should have a calm, magical, fantasy feel, with lifelike proportions and soft lighting. Full-body model, ideal for 3D printing