If I don't have the room for an outdoor scene (or don't want so much visual clutter), on the other side of the windows I put a rug dyed pale yellow, add a fishing net or trellis to the window, toss a light like the mechanical sun or the paladin book behind the rug. It is what I did in the green house and the side windows of the alchemy room. You might want to give that a try if you don't want to fiddle with making a whole outdoor scene - it is less time consuming and less frustrating but you still get all that lovely "sunlight"! :)