character portrait of a graceful beautiful mermaid looking at the sunken city of Atlantis deep under water, stunning undersea intricate detailed grand architecture in the style of Joe Fenton, art style by Greg Rutkowski and Mohrbacher and Gerald Brom and H. R. Giger, deep underwater scene, dark and moody, rays of sunlight, faint volumetric god rays, grim crushing atmosphere, trending on artstation, masterpiece, claustrophobic, dizzy, sharp focus, 8k octane beautifully detailed render, post-processing, extremely hyperdetailed, intricate, epic composition, grim yet sparkling atmosphere, cinematic lighting + masterpiece, trending on artstation, very detailed, Art Nouveau