I don't think that going black & white really helps most portraits. The color photo is the nicest to look at. The B&Ws are lacking contrast both in processing and composition, and in the third one her shirt is dominating. I think the second photo needs to be rotated a tiny bit clockwise.
I agree with the comments about the lettering. A little script font in the corner of a photo might not be too distracting, but the lettering here screams "hey look, my name!"
I think that you did a really nice job posing your subjects. Definite potential IMO.