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I'm thinking ... IQ is pretty darn good @ that ISO, as is WB and wondering what lens you used (assuming 70-200/2.8 variety) with or without IS, PP or sooc ... still showing a little bit of pop/depth/micro-contrast etc., with nice tonal transitions in both the highlights and shadows. Technically ... it makes me sit up and take notice, considering the challenges of typical high school stage productions.
I think you've done a nice job of capturing "the moment" as she is "pointedly" telling him something and she is commanding his attention. All in all, I find it to be quite fine for that kind of a shot. Nothing really to offer in "how to improve" upon it.