Create a hyper-realistic, Medieval Dark Fantasy image of a mermaid weaving an algae purse while sitting on a coral chair inside an underwater, aquatic home. The house has seashells hanging on the walls as light fixtures and a bed formed from a large shell with a plush cushion. A window is nearby and outside you can see the display of a mermaid city, the image resembling Atlantis. Illustration style. Intricate and high detail.