I would have her more in the natural light. Especially the train part of the dress. She appears to be still walking up the stairs and cannot see the rest of her arms and it look like she may be struggling by holding the dress. If you take the shot again have her slightly turning around so you can at least see her profile.
i find faceless photos to be extremely useful for my watchers. if they have their own characters with specific looks, then looks of my model doesn't distort what they imagine their character to look like. thats part of the reason why for alot of book covers there is hardly any faces showing.
Is there any chance you could have done one shot without the face and one with? I appreciate what you say about faceless shots, but I most often use stocks for pose/clothing references so it wouldn't matter to me what the model looked like specifically. I realise I'm only one person and it's entirely up to you which stocks you take anyway (thank you for providing them at all!) but it might be something you could consider.