underwater space cities, mermaid swimming in background, intricate detailed, photo realistic, cinematic lighting, octane render 
underwater space cities, mermaid swimming in background, intricate detailed, photo realistic, cinematic lighting, octane render --q 2 --v 4 --s 250 --upbeta
underwater space cities, mermaid swimming in background
intricate detailed, photo realistic, cinematic lighting, octane render
an underwater scene with a castle and a scuba diver
an underwater scene with a shark swimming in it
an underwater scene with a person swimming in the water
an underwater scene with a mermaid and fish