A realistic portrayal of a mermaid swimming gracefully in the depths of the ocean surrounded by shimmering air bubbles, illuminated by ethereal beams of light, creating a captivating photorealistic scene in hues of light blue, with an 8K resolution and dramatic cinematic lighting, showcasing her mesmerizing scales and flowing hair as sunlight filters through the water, enhancing the serene and mystical underwater ambiance with an aspect ratio emphasizing the towering underwater environment.