What I find to be the greatest about that picture is her lips.
It looks really fabulous like that we can see on the pic. Especially because of light coming to the lips, her chin, and part of her nose from that specific angle, I suppose from the direction where the window is, or a lamp. The scene from the picture is like telling a story about her, what persona she is, her nature, something like that... Looks really fabulous.
It's like a scene that deserves to be staged on a movie about her, a movie about her life or something.
I have an image in my collection that looks similarly inspirational:
This one also looks fabulous.