The fact that you 'painted' that window with light really helps out a lot. I usually just bring a flashlight when I paint with light but this is something that I'll definitely try to sure. The tone really adds another layer to the picture, making it very eerie. The details, the stars through the thin moving clouds and the structure itself are all very nice elements. This is some interesting work indeed, I really like this a lot.
For some reason when I first saw this I thought of the x-files theme music. The light in the barn feeling a little menacing, with the stars just poking through the cloud cover. Nice job.