A breathtaking portrait of an ethereal mermaid with flowing, luxurious long hair that ripples through the water like silk. Swirling around her are countless delicate goldfish, their scales glinting softly amid the shadows of the ocean depths. Enveloped by the vibrant tapestry of marine life, she floats gracefully, her serene expression glowing amidst the subdued underwater twilight. The light filters down faintly, casting a gentle spotlight that highlights the intricate details of her ornate jewelry and shimmering tail. Rendered in a cinematic 35mm quality with an F/2.8 aperture, the scene captures every exquisite detail in 4k resolution, enhanced by a subtle vignette and masterful cinematic lighting, creating an atmosphere of elegance and mystery.