The light on the child's face is completely even in the first two, creating a very strong "flat face" impression. Try to get some very soft and directional light from one side or the other in future.
Not in love with the wooden moulding visible behind the kid in the first one, it's a bit distracting and adds nothing.
I'd try for a little more diagonal flow, the first two are pretty much the kid straight across the frame.
The third one is quite decent. There's some light and shadow to give a little shape to things, there's a diagonal gaze across the frame. It's a nice pose. It feels quite underexposed, there's a feeling of dimness and her hair is a flat black mass.