you were punished by the conservative voting crowd here. this image is better than the score it got, both in general and with specific reference to this challenge. i think it should have scored in the range of 6, myself.
Interesting choice to de-focus the subject -- makes one stop and consider what's otherwise a pretty ordinary and largely monochromatic composition. Such daring is rarely rewarded at DPC, but maybe you'll do better than usual : )
I think I might have liked it better if the distant tree were in focus. Obviously you meant to do this, and that is the reason why you left the foreground branches in, but it doesn't work for my compositional aesthetics. Anyway, the colors surrounding the tree look very nice, and there are some defined lines, but the blur just detracts from the image.