I reckon the state of the tree is a clue too. It looks deciduous to me, so we ought to see exaggerated dark veins due to bare branches from the winter part of the image. The branches will be displaced by winds, so the tree ought to look blurred. The dark blue sky and dark shades of green in the tree suggest a moonlit or twilight scene. And in the left window, the curtains appear to be drawn together...
Steve
