a beautiful mermaid looking at the sunken city of Atlantis under water, ray of sunlight, stunning grand architecture, art by artgerm and greg rutkowski and alphonse mucha, 8k octane beautifully detailed render, post-processing, extremely hyperdetailed, intricate, epic composition, grim yet sparkling atmosphere, cinematic lighting + masterpiece, trending on artstation, very detailed, vibrant colors, Art Nouveau, god rays