A lifelike mermaid glides gracefully amidst a flurry of air bubbles in the ocean depths, her shimmering tail reflecting a spectrum of light blue hues. The scene is captured in breathtaking photorealism with a stunning 8K resolution, revealing intricate details of her flowing hair and delicate scales. Bathed in cinematic lighting and a soft floodlight that penetrates the water, the atmosphere is both mystical and serene.