Out of the three un-tagged people in the middle, I see that classmate of Akiha (I think, and I don't know her name) to the left of what appears to be a tweaked arcueid, and somebody I have no clue about who she is. Not tagging anything out of uncertainty.
Arcueid has slightly shorter hair, and since she's right next to Akiha's other classmates Hanei would make sense. (Actually, everyone in this picture except Sion is related to Akiha.)