PROMPT:
A whimsical underwater metropolis bustling with life, where majestic sea creatures, merfolk, and steam-powered machines coexist in harmony, set against a radiant turquoise background, illuminated by a warm golden light casting intricate shadows, vibrant colors abound, with iridescent scales, shimmering fabrics, and polished brass accents, as a regal octopus king sits upon an ornate throne, surrounded by schools of rainbow-hued fish, while a group of inventors tinker with a massive clockwork submarine, in the heart of this fantastical urban oasis.