Very nice. My only nit is in the second one. To me her neck looks awkward tilted that far back in her laugh. My eye is also drawn to the peace corps sign. Although it is blurry, it is still legible which draws the eye. Thanks for sharing.
She's centered in every frame and the horizontal shots not working for me one bit. Otherwise, nice clear images of a happy subject. Try to not dead-center your subjects and if you must shoot in landscape make sure to include some environment.