Ok... I just realized that 4+ years ago this was among my selections in the "Pick your fav image from the person above you" side challenge. This week I had the realization that "picking a favorite" should have included a comment about why. So I've been back over the last 1600+ posts to make amends for my omission.
Although it seems you've not been active here for a while, here's my belated comment:
Not sure why this was ranked so low. For me, it's a wonderful representation of the theme and effective in commanding my attention. Finally, it holds up well to time. This exercise of mine (returning to view an image after several years) confirms my appreciation of your photo.
The tones and soft focus in spots is incredibly soothing to me. I'll need to remember to come back and stare at this after a hard day of judging under-creative challenge attempts from all those who gave this under a 5. Though there does seem to be a bit of what I assume is dust on your sensor, I don't think it should have been a big factor in scoring in an open challenge.
It's hard for me to tell what this is, but that isn't stopping me from liking it -- not sure how well it appiles to the actual description of the challenge, although I see how it adheres to the general idea of minimalism.