Fantastical and surreal large floating island with a futuristic alien city with many buildings, trees and a giant crystal under the island, cosmic sunset, shooting stars, concept art, complex, hyperdetailed, photorealistic, deviantart, digital painting, digital illustration, extreme detail, digital art, 4k, ultra hd, beautiful landscape, realistic and natural, cosmic sky, detailed full-color, nature, hd photography, fantasy by john stephens, galen rowell, david muench, realistic surrealism, elements by nasa, detailed, alien plants, gloss, hyperrealism, High-tech