A photorealistic scene depicting a mermaid gracefully swimming through the depths of the ocean, surrounded by shimmering air bubbles, her tail glistening in shades of light blue. The cinematic lighting creates a floodlit effect, casting soft shadows and accentuating the intricate details of her scales. The ethereal atmosphere is enhanced by the gentle sway of her flowing hair, moving like seaweed in the deep aqua waters, with hints of sunlight filtering from the surface above. The vertical aspect ratio accentuates the expansive depth of the ocean realm, capturing a moment frozen in time, as though she's a part of an underwater ballet.