How I Do For Make A Mermaid - Related Lobby?

Hi! I wanted to know how i make a mermaid-related lobby for our game called "Mermaid High" Without stealing, Choosing free models from the tool box, We need the main place for Mermaid High. Inspired by JodiexBear's Map. If the only thing that we are looking for ideas can be added in Mermaid High.

My tweeter: https://mobile.twitter.com/RoyaleCureLaMer (DM Me if you have any ideas on drawings)