this is a wonderful tile for the fact that it's just part of a picture; it leaves a lot to be blended and doesn't give the quilt a "boxes" effect. Only thing you got to watch for is the corner borders you get. that would give you a clue that it would never be possible for this window to go all the way around. also make sure you blend everything. You watch for these things, and dark edges on your borders, and you'll do just fine.
happy tiling :)
-greg