It would be nice to see the origional unprocessed images as a comparison.
Out of the first 2, I prefer the second in b & w. I think it has more of an emotional feel too it.
I like the expression caught on the kids face in the third one.
It would be nice to sort out the spill of light that is blowing the childs forhead in the first to as well. Also something odd is happening with the skin. The child's seems very smooth and porcelain like, whilst the mothers looks oversharpened. There is a distict difference in skin tones but that could simply be the make up on the mother.
All have the potential to look great, particularly 2, but maybe more practice in PP. Less is more. That said I'm no expert in PP at all, I am hopeless at it, hence the less is more attitude!!
Rob