Create a (((sexy mermaid illustration))), drawn in a (((vivid, bright white and deep crimson color scheme))), with intricate details that capture the essence of a (fantastical underwater realm). The scene features a beautifully drawn (((mermaid figure))), with a flowing tail and fins that are detailed and contrasting against the crystal clear waters. The background is a colorful coral reef with vibrant colors that match the mermaid's elegant attire, creating a mesmerizing contrast between the delicate underwater beauty and the vibrant ocean backdrop.