The compositions look alright to me.
I'm viewing on an uncalibrated screen right now and this might be an intentional style thing, but IMO your white balance is shifted noticeably towards green. That can be less flattering for skin tones. I would bump that back towards purple instead, and your backgrounds should still retain their natural greenness.
In some shots it looks like you might have sharper focus on other parts of the costume than the eyes/face. In portraiture you usually want to prioritize focus on the nearest eye; use single-point autofocus that you can manually select and focus/recompose before shooting if needed. Or if you're already doing that, maybe try shooting some angled test grids or a ruler to see if you have a backfocus or frontfocus issue with your autofocus system.