Wonderful framing of the dog by the chair backs, and surprisingly sharp and good colour considering it's through a window. You might crop the left side a wee bit and the top, or use clone to get rid of the black mini-triangles in the upper left corner and 2/3 the way across the top towards the right. Also, the uprights in the image are a bit angled, so you might consider straightening them. There are a few imperfections from the window (white spots and a small streak, all on the right-hand side, that you could clone out as well. Otherwise, a wonderful shot.
Gail R.