I’d have a look at using some shadow work to give a realistic glow affect to the sun, as it really shouts moon at the moment unfortunately, I’m not too sure what the use case is, but I could imagine it looking x100 better animated, with the clouds bobbing from right to left etc.
Loving the purple, but it does give a night feel to the entire photo. Superb mountains, very realistic yet minimalist at the same time!