Best quality, masterpiece, Epic, cover-art, Subject: Luminous Leviathan. A colossal, serpentine creature, iridescent scales, bioluminescent markings, radiant blue, fiery orange, vibrant green, shimmering silver, gleaming gold, hovering above, underwater cityscape, towering structures, glowing neon lights, dark shadows. Camera angle: Low-angle shot from below, looking up at the Leviathan's majestic form. Drawing style: Realistic, Impressionist, Abstract. High-quality, 4K, detailed, ultra HD. Best quality, professional, Portrait, photo shoot,