This is a piece done by Ilyas Dudarev. It can be found on ArtStation at the link above.
I like the way that light is used to separate the cave from the outside environment. The cyan glow from the central structure bounces light up and into the nooks and crannies of the cave. It also frames the teeth of the cave against the harsh winter environment. I also like the shadow of the figure on the cave floor. His long shadow emphasizes the power of the structure before him.