Rotate the camera 90 degrees would be my suggestion, and increase the distance between the wall and her, to throw the backdrop even more out of focus. Portraitlightingdot net is a fgood web site that goes into some good portraiture fundamentals, and has a pretty good explanation of the mask, as mentioned by Aye-non Oh-non Imus, in a shot of a man who is in his early to mid-50's and who has a rather round face. The author of the web site shows examples of where only the mask of the facde is lighted, and the sides and under-chin areas are allowed to go into shadow, versus a shot where the entire neck,cheeks,and side of the head are lighted about as much as the mask of the face. After seeing the side-by-side photos, it becomes a very clear concept.