Advice on this Northern Lights painting?

Hello! This is my first time posting, glad to be here! Anyways, I’m painting this for an upcoming holiday craft show and something seems off. I’m about 80% done. I’m still going to add stars, clean up some details and smudges and I need to add rocks and water. (Those rocks are pencil sketches of where I want to paint them) I really like the snow and the trees and I like the sky but to me it seems like to separate paintings merged into one. Do you have any advice on how to help that or any general tips? I also added the reference photo, since I’ve been looking at this so long I’ve become convinced this is not a real photo, maybe AI. Still linking it tho.