Create a high-resolution, photorealistic image of a mystical underwater city illuminated by bioluminescent sea creatures. The scene should capture the enchanting beauty of the city, with coral structures and seashell buildings glowing in various shades of blue and green. Schools of colorful fish swim gracefully through the streets, while jellyfish float above, casting a soft, ethereal light. In the center, a grand palace made of shimmering pearls and crystals stands majestically. The water is clear, allowing beams of sunlight to filter down, creating a magical interplay of light and shadow. The overall image should evoke a sense of wonder, magic, and the serene allure of an underwater fantasy world.