Child's hand is lopped off at the wrist. The child's body is lopped off at the thighs. It is a seated pose: the baby ought to be shown, "seated". Too much top space, and the "base" of the portrait is what is called "incomplete", since the fact that the kid is seated is not actually shown. This is the psychological equivalent of showing a standing person at a red carpet event, then cropping them off right at the ankles. Sure, we realize they are standing, but when it is not actually SHOWN, the image is not given the proper degree of acceptance. Having that hand amputated right on the bottom right edge of the fame makes for a very strong discordant element. Not showing the actual "seated nature" of the infant...again, same thing...that's why despite the beautiful lighting, the cute props and nice set, the image does not seem "right". If you ever work for one of the big chain-type studios that do formal portraiture, they will teach you these kinds of formal "rules of portraiture" so that your images will meet with psychological approval with buyers and viewers.
If you want to see how bad the amputation and incomplete "base" are, try cropping this to a tight shot, with just the one hand in it....crop out most of the top space...the picture suddenly becomes better.
The camera height is also several inches too high--that's why the baseboard chops the kid in two at the neck.