In response to your request for an in depth critique, due to the lack of photogrpaher's comments, I can only offer my critique based on personal opinion alone, since I do not know what your intentions were for this photograph.
That being said, I think that this fits the challenge perfectly. Great DOF, forground and background are both nicely blurred putting the focus on the main subject, which is the bead in the center. The center bead is in nice focus and we get a lot of great detail in the bead. I particularly like the tiny white specks.
I see your comment suggesting that you feel this should have scored higher.
One thing that I notice about this photo, is that while it is technically a well done photo, it is a little difficult to tell exactly what it is we are looking at, and it does have a bit of a dark feel to it. I think that had this maybe been on a brightly colored background, it might have had more visual appeal to the majority of the voters, and might have gotten a bit more 'wow factor'.
I'm wondering if maybe the oof drop in the front might just be a bit too large in comparrison to the drop that is in focus. Maybe just a bit overpowering.
I like the angle and the diagonal positioning of the objects. Creates nice flow through the photo.
Overall, technically well done, but missing something that draws me in and holds me there. Possibly color.