I did a similar shot, and hope you are not gettig the same comments I am which is that this image is too centered. Clearly the intersecting lines are right on in your shot (and yours is much better than mine). Lovely image and the black and white really work well in this shot. -- 8 --
Nice placement of eyes along the top third and the one eye at the right/top intersection. Very captivating eyes, even if a little smug in expression. Light on the face is very nice with pleasing modeling. Reflection off the lips is a nice touch also. Eyes don't quite seem sharp though.
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The softness seems to be in the whole photo, which may be deliberate (If so, please disregard this part of the critique). I mention the eyes b/c that is the subject of the photo.
My personal taste would be to use the USM filter in photoshop to sharpen the whole image up just a little. It wouldn't take much though, just a touch. The photo is very powerful as it is.
The theme of "a mother's weakness" is a nice emotional dimension. Although I don’t have any kids yet, I’m sure many will relate well to the emotion. The expression on the child's face is a somber one and my preference is toward the reflective to chipper side.
BTW-those eyes are AMAZING!