A photorealistic image of a mermaid gracefully swimming in the ocean's depths amidst a cascade of shimmering air bubbles, her shimmering tail catching glimmers of light blue hues. The scene captures the mood with cinematic floodlit lighting that casts ethereal shadows and highlights across her serene face and flowing hair. Delicate particles dance around her as she moves, creating an atmosphere of tranquil beauty in an underwater realm that feels both real and mystical. The mermaid's eyes are imbued with curiosity, gazing into the unknown with a sense of wonder.