I like the composition as such, and exposure is great, but it's not clear to me why she's on the stairs...in the middle of the day and in lingerie. While I don't mind the sentiment, it seems a bit out of place or rather the 'story' is off. She's beautiful, the shot is beautiful, but it says something close to 'why am I waiting?' which isn't too compelling for me.
Thanks for the feedback - any imaginary hints of a story that you would tell instead? Anyhow - I treated the whole thing as more of a still life than a portrait or journalistic image.