What we have here is a not terrible pose except that almost all models do it and this model does it every time she models. I'm referring to the hand on top of the head pose. She does it sitting and standing. If you were on the other side of the room her arm is not visible so her hand is just sitting on top of her head like a hat which looks very disturbing.
Many artists are after something entirely different in their art than I am and don't mind this sort of thing at all, but I want a natural looking movement and this is a very contrived movement to my eyes.