Dianna, that's a very clear resource photo for his face. The problem I'm seeing with the hands and leg is that they are closer to the camera than his head, and therefore they look disproportionately larger. Because of this they also draw attention from his face.
What about having your son doing something more natural: working on a model or reading a book or playing with a toy of some sort? Allowing him to become somewhat engrossed in an activity and then calling his name just as you're ready to shoot, or telling him to look up, can be very effective.
An artist who had also done a lot of professional photography told me once that a more natural-looking expression can be captured if you have the subject looking down as you're setting up and focusing, and then have him look up just as you're shooting. Hope that helps!
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