I like the purple in the out of focus area to the right of the subject (rose), but I think it is a bit too much negative space. A tighter crop would enhance the subject but then you would lose the purple bokeh. I think the shot may have come off a little better if you had a different shooting angle that would allow for the tighter crop and still have th purple above/around the rose.
like the bokeh with those little purple flowers in the background makes the overall colors look unreal..pretty rose, I have something similar, smells delightful..
it's a lovely image, but it really stretches the challenge idea...there's nothing special about it, it could have been a photo of anything, because light falls on everythng, sorry :-(