I liked the expression in this one but I'm pretty biased with my feelings about this particular model.
Thoughts?
I think that your bias is pretty evident in the shot and
that this is a good thing.
What I mean is that the portrait is very intimate: she's not "overposed", she looks both a little shy and yet enjoying flattered by being photographed and her eyes say that the flattering comes from the relation with the photographer.
Looking at the photo gives me the same feeling that I have looking two lovers holding hands and smiling to each other while walking.