A painting of a castle in the middle of a body of water

(ultra-detailed, best quality, HDR:1.2), underwater kingdom, majestic king of the sea, powerful trident, shimmering scales, graceful mermaids, mythical creatures, vibrant coral reefs, mysterious shipwrecks, mesmerizing sea colors, ethereal lighting, enchanting water reflections, mythical aura, breathtaking depths, captivating marine life, mythical underwater city, majestic seahorses, magic and mystery, ancient ruins, hidden treasures, sparkling golden sands, endless ocean horizon, grandeur and beauty, otherworldly aquatic creatures, divine power, soothing ocean waves, mythical battles, mythical creatures emerging from the depths, divine underwater landscapes, serene aquatic paradise, royal underwater palace