For instance if I take this one to the painting stage it's quite possible that I'll change the angle of her head so she seems a bit more engaged.
I'm imagining her talking to someone, but who? An ambassador , a servant, a soldier reporting on the war, a suitor or a prisoner? In any case I think it would look better if her face was turned slightly towards us so that whoever she is addressing is seen from behind and is closer to us the viewer. Generally we're going to respond better to a composition that leads us into the painting rather than one that moves side to side. So looking past an unimportant character and into the eyes of the girl on the throne makes for a more engaging composition.