The color and sharpness and quality etc. look nicely done. Maybe it would have helped to adjust the vantage point, scrunch down/take along a stool etc. to be at a lower vantage point. From the angle used some of the photos caught an edge of the darker green background above the tall golden grasses that created a horizontal line or area across the top of some photos.
I can't tell what's laying on the mattress that's tan/brown but it looks like that needed to be moved out of the way or she needed to be repositioned so the thing would be out of the frame. It didn't add to the photos, just made for a darker triangular shape that makes for a visual distraction. There's also one where the feet are cropped off/not in the frame.
When she moved onto the sand, as she moved so did the hair. That created lines across the white t shirt that don't need to be there.
I imagine they'll like the pictures, but then, who doesn't like what they get for free? So I'm not sure how much that would tell a photographer about how well the work was done. And unless you're planning to get into doing portraits, and getting releases signed (by parents if subjects are under 18), and working on a portfolio, etc. this likely could be taking work away from portrait photographers in the area.