Highly imaginative, concept artwork, full body view, (unicorn riding mermaid:1.9), magical friendship, exploring an enchanting underwater castle, schools of colorful fish, coral reef formations, seaweeds adorning doorways, glowing bioluminescent marine life, shimmering iridescence, serene water droplets, dreamlike lighting, watercolor, digital painting, whimsical ambiance, captivating composition, fairytale feeling., Accent lighting, Hypersaturated, Kawaii, Color Grading, Astute detail by: Peder Severin Krøyer, Henri Rousseau
(Unicorn riding  Mermaid:1.9) exploring an underwater castle.