I like the atmosphere here, and how smoothly the shading transitions from light to dark.
This also reminds me of the level called "Gloomy Glacier" from the video game "Spyro: A Hero's Tail." (and the level's lovely eerie soundtrack, which I suggest looking up if you've never heard it before!)
I'll definitely check that out, I've played a few Spyro games, but not that one. Have heard of it though.