Auroras already looks magical by themselves and it was fun creating a fantastical scene with it. I will try painting more of them in the future. I love auroras and I hope to see it in person one day :)
I started with the base colors and then on the new layers I added details. For the waves I used some puppet warping, to achieve a more jagged look. I had a hard time controlling values here, since it's a night scene with additional foreground elements. This are supposed to be flying garden islands with bridges connecting them.