Skin tones seem a bit cool and slightly yellow-tinged to me. I'd crop #2 down some...all that empty space seems a bit odd. The last one looks a bit over-flashed to me. Looking at these larger, and closely, I can see a slight bit of blurring due to the flash and ambient exposures being so close to one another, and her moving very slightly during the shots. As far as emotion and expression, she seems pretty good for a h.s. senior. I've seen much,much worse photos, and these seem to be somewhat like what I think a lot of today's kids would think would be senior photos.