Portrait of an enchanting mermaid with flowing hair, surrounded by a flurry of colorful goldfish amidst a vibrant tapestry of marine life. The dim ocean light filters softly through the depths, creating a mysterious ambiance. Captured in a cinematic 35mm style with an aperture of F/2.8, the scene is framed with a subtle vignette to enhance focus. The image is rendered in 4k with spotlight and cinematic lighting, presenting an exquisitely detailed and elegant composition. Her scales glimmer with opalescent hues, adding a touch of ornate beauty. The backdrop is a symphony of coral and sea plants, each intricately detailed, enhancing the tranquil yet mystic underwater setting.