Create a breathtaking, whimsical artwork featuring a majestic Unicorn Mermaid rising from the center of a vibrant, underwater city. Depict her shimmering tail with pastel hues, lace patterns, and sparkling gemstones. Use oversized seashells as radiant headlights, framing her gentle, animal-like face. Surround her with schools of rainbow-colored fish, a hidden treasure chest, and a whimsical, submerged metropolis complete with fairy lights, coral buildings, and playful sea creatures. Employ watercolor textures, delicate lines, and intricate details to capture the dreamy, fantastical essence of this romantic scene. Make sure our Unicorn Mermaid exudes regality, kindness, and a sense of adventure, inviting viewers to explore her enchanting underwater world."assistant