underwater space cities, mermaids swimming in background, intricate detailed, photo realistic, cinematic lighting, octane render 
underwater space cities, mermaids swimming in background, intricate detailed, photo realistic, cinematic lighting, octane render --q 2 --v 4 --s 250 --upbeta
underwater space cities, mermaids swimming in background
intricate detailed, photo realistic, cinematic lighting, octane render
an underwater scene with mermaids and fish
an underwater scene with mermaids and pillars
three mermaids in an underwater scene
an underwater scene with scuba divers and fish