Prompt: 
underground city, concept art by Cedric Peyravernay and James Gurney, global illumination, detailed and intricate environment, oil painting, palette knife soft brush strokes, heavy strokes, paint dripping, trending on artstation, sharp focus, intricate details, highly detailed
Negative prompt: blurry, low quality, crooked lines, ugly, bad, flat image, jpg, meaningless, distorted people