A realistic depiction of a mermaid gracefully swimming in the depths of the ocean, surrounded by shimmering air bubbles, with her iridescent tail catching the ambient light. The scene is bathed in a soft light blue hue, with the clarity and sharpness of 8K photorealism. A gentle floodlight casts cinematic lighting across the scene, highlighting the mermaid's delicate features and the intricate patterns on her scales, evoking a sense of wonder and tranquility in this underwater realm.