A photorealistic depiction of a mermaid gracefully swimming through the ocean depths surrounded by shimmering air bubbles, set in a palette of tranquil light blue hues. The scene is illuminated by an ethereal floodlight, casting cinematic lighting that accentuates the mermaid's intricate scales and flowing hair. The composition captures the mysterious allure of the underwater world, with beams of light piercing through the water's surface, highlighting the serene yet dynamic movement of the aquatic environment, rendered in stunning 8K resolution.