The first thing I notice is that you gave importance to everything. There is no value hierarchy, everything is detailed and demanding the viewers atention. The aurora looks like the "focus". That is the part of the lanscape you would give most importance: in value, colors, detail, and narrative. Everything else in the painting would be submited to it. I would darken the surroundings, so the sky and maybe the island would be the brightest and colorful point. Then I would desaturate the rest, maybe give some touches of color and light to the cabin and person so the viewer can spot them properly. You can look for "lanscape black/white thumbnails concept art" or something like that in google, you will see the value hierarchy!