The viewer's eye is automatically drawn to the brightest area (and/or most contrast)....so the sweater is stealing attention away from the face. I wish that her skin tones (face) were a bit brighter. It's hard, I know, because the white sweater is already so bright. Maybe you could tweak your B&W conversion process to help brighten the face. Then maybe a bit of careful dodging & burning to find a better balance between the sweater and face.
Also, you should avoid having your subject's (especially women) hands posed so that the back is toward the camera (as in pictures 1 &2). If you can, it's best to have them show the camera the thin side of the hand.