Well, I went with the majority of opinion here and went almost black with the right half of the background, with a thin white line to differentiate between background and foreground. I like this since as as been mentioned it has pushed the woman forward and, I think, heightened the impression that she is standing at a large window.
I titled this piece "Is He Coming?"... and it is now framed and hanging since I feel any further work could ruin the piece.
Thanks for all the advice, everyone. This is such a great site for bouncing ideas off people other than family who think everything you do is great (or are afraid to say otherwise