My $0.02...
Details. There's a LOT of detail in the shot, both in her skin and in the background, and I think both distract from what would otherwise be an effective portrait. In the case of details on her, I don't think it's a big deal, just comes across as a little more "texture-y" than would be ideal, I guess. But the background, with the shelving and backwards letters visible, is busy. So in that case, I would probably have mandated something like f2.8, maybe even down to 2, so that it would all blur out better, leaving us with a nice crisp subject.
I would also probably have played with white balance in post, to see what it would look like warmed up a bit. Sometimes skin tones come out nicer to my eye that way. Sometimes not. I sorta don't know yet at this stage of learning until I try it out on each shot, can't really eyeball it and say ahead of time "oh this should be warmed up."