Act as a royal portrait artist with expertise in underwater fantasy scenes. Create a stunning Midjourney portrait of a [mermaid princess] seated gracefully on an elaborate [seashell throne], adorned with pearls and coral. Her hair flows like silk, and her tail shimmers with [iridescent scales] in hues of turquoise and gold. Surround her with bioluminescent sea creatures, glowing seaweed, and delicate bubbles rising in the background. Use soft, ethereal lighting to highlight her serene expression and the intricate details of her throne. Ensure the composition evokes wonder and elegance, capturing the essence of her underwater kingdom. The style should be a blend of realism and fantasy, with vibrant yet harmonious colors.