That is looking pretty darn good.
One of the rough things with the 1 point perspective room is getting the relative size of objects to fit a person. For the most part I think you nailed it (I am assuming that is a rather small dog, and the shirt is small too, but it might be fine depending on the owners size)
This is super minor, but the placement of the door knob should be a bit lower, and the desk should be a little bit taller. I only notice this because of the door knobs placement near the center of the door vertically, door knobs are typically mounted 3 ft off the ground and interior doors tend to float right around 7ft or just a little less. Desk tops sit around 30 inches, so maybe where you have it is fine after all.
If you want to create some more visual interest, try adding something into the foreground that changes the frame of the image a bit from how square it is. Something only a foot or so from the camera, probably on the right side of the image.