Prompt: Black market alley fantasy setting. Submerged in water. Entire market is underwater. Blue merfolk selling and swimming. Mercantile exchange. This is a market.

Hyperdetailed. Superhero comic book art. Extreme detail. 

Comic book art. Hyperdetailed. Vibrant colors and lighting., trending on artstation, sharp focus, studio photo, intricate details, highly detailed, by greg rutkowski
Negative prompt: sci-fi, humans, white skin