Great work on the hair and face. Great choice of the lipstick.
A couple hair flyaways against her left shoulder could be cloned out. Flowers are better, could still be desaturated a bit more, but they are ok.
She's got a death grip on the mortar board. Maybe have them support the caps with their left hands and "caress" it with the right hands that are showing. All the fingers should be comfortably curved and not straight or hyperextended as on fingers 2 and 3 on her hand here. [Did something go wrong on post-processing her pinkie finger? It looks white/pasty instead of matching the rest of the fingers.]
Let's talk about focus technique. Are you using focus-recompose? Are you choosing a focus point that is right on her eye? If you are doing focus-recompose, you could be moving the camera just enough to pull the eye out of focus.
I also noticed that the focal length on this was 65mm. You're using the 24-105mm zoom (one of my favorite lenses), you may want to get it up to the 90mm range. That will slightly flatten the face and noses become slightly smaller.
She and her parents will likely be delighted with this shot. I'm guessing it will go in the yearbook as a smaller print. The wrinkles on her collar and left sleeve will be less noticeable at a smaller size. Also, do you know what cropping ratio the yearbook will be using? If you can crop to their format, you'll have control of the crop. Otherwise, they will crop where they want to...and that might not be where you want it.
Great work again.