Looks like a wonderful personality, obviously at ease with the photograher. Focus is not on the eyes though which is one of the first things to look for in a portrait.
There is something odd... It seems like the eyes are slightly out of focus, or perhaps were moving at the time this image was shot it may be the large reflectios in them as well - can't tell without blowing it up. I like the composition and lighting, and the natural expression is excellent. But, in a portrait the eyes are everything.
woo-hoo, you nailed this one! excellent work. the only thing i would suggest would be to zoom in a heal the veins in her eyes. well, that, and the background to the right being a little distracting, but, all the same, what a killer image! love the expression! good luck!