砂漠にそびえる巨大な異星人の頭蓋骨の中で栄える活気あふれる都市

An advanced civilization that created its foundations inside a gigantic alien skull. The skull is out in the barren desert, but the skull has a vibrant city with buildings, roadways and spaceports. The city is an oasis in the middle of a barren desert. The image is done in a fantastic science fiction style mixed with the color palette of modern fantasy