A breathtaking portrait of an enchanting mermaid surrounded by a shimmering school of tiny goldfish, all set against a vibrant marine backdrop. Subtle rays of light dance through the water column, creating an ethereal glow. The scene is captured with a cinematic 35mm lens, F/2.8, featuring a soft vignette and spotlight for dramatic emphasis. The composition is rendered in 4k resolution, with intensely detailed and intricate features, showcasing the mermaid's elegance and ornate beauty. The tableau is super detailed, capturing the mesmerizing allure of this underwater realm, with a vertical aspect ratio of 1:2 and a quality setting of 2, enhancing the overall visual experience.