Well photographed and perfect for the challenge.
If it was mine, I'd probably crop out just some of mom's head/neck
to draw complete attention to the child, and keep a 1/3 - 2/3 ratio.
Nice... improvements suggested... crop more of the woman out and right side and bottom which will also get rid of the distracting hot spot on her neck and the distracting black bra strap. All you need of her is about an inch past her ear and only a sliver of her left shoulder. Next time bounce a little light into the child's face which will also brighten up the eyes that are a little dead. The lighting from the top is a bit bright washing out the child's hair and giving the shadow on the face. Nice pose but needs more thought as to distracting elements and lighting.