Why is the starry sky visible during the day?
Because the solar winds stripped the atmosphere off the planet.
This was fun to work on. It went through many stages...
Detail shots on tumblr.
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Nyx: You exile me for another thousand years, and I come back... To this... You appointed me as a defender of the citizens of Equestria, and although I failed to save them... You can be sure I will avenge them!
Love it. Guess this it not how Nightmare Star imagined her eternal day to look like. Or judging by the look on her face, it totally is. (Or she just really don't care about it, can't say for sure. )