This shot -is- well squared off.
Of coarse the cam height and/or left-right axis/shoot angle could be changed, not saying this would necessarily yield a better composition though. Experiment with these and develop your shooting eye.
You can always crop down a shot, but you can't add what isn't in the frame. A little more of the subject at the top might have helped it.
To me the blank space on the left is distracting and pulls you away from the lively parts of the image.
Crop example, image quality greatly reduced to get file size to fit here