Create an ultra-realistic image of a breathtaking mermaid swimming gracefully underwater. She has long, flowing hair that glimmers with shades of aquamarine and sea green, cascading around her like flowing water. Her captivating eyes are large and mesmerizing, with iridescent colors that reflect the ocean's depths, drawing viewers in with their enchanting allure. The mermaid's tail is elegantly designed, adorned with intricate scales that shimmer in vibrant hues of blue, teal, and silver, catching the light as she moves. Her skin has a subtle luminescence, hinting at her magical nature. Surround her with a rich underwater landscape filled with vibrant coral reefs in shades of pink and orange, schools of colorful fish darting playfully around her, and delicate sea plants swaying gently in the current. Include soft beams of sunlight filtering through the water's surface, creating a magical atmosphere that highlights the beauty of her surroundings. The overall scene should evoke a sense of wonder and serenity, capturing the enchanting essence of the mermaid's world as she embodies grace and beauty beneath the waves.