This is very easy pose to make your high school senior look great. Simply find some grass being lit by a late-day sun and have your senior take on this pose. The slightly tipped head causes her hair to flow nicely. The crossed bare feet are framed just to the side of her head – but not intersecting her hair line. The jeans form a border around most of her visible shirt.
This amazing lens with an f/2.8-selected aperture takes care of the rest.