beautiful sky, but maybe could have cropped the foreground or chosen a different one - doesn't quite fit the mystifying and elegant/smooth look of the rest of the image.
Using a foreground with less color, or just a silhouette would have grouinded to aurora as well, but as it is, the bottom is colorful enough to compete for attention.
are northern lights moved by wind? i thought it was more to do with magnetic fields or other mystical things... anyway, there have been too many of these type of shots of late, and they're beginning to lose their appeal / originality. The fact that yours has nice bright, clearly visible stars should be congratulated, but this is offset by the inclusion of the rooftops, which i fear are too distracting and add nothing to the composition. 4.