The composition is nice. I like the diagonals. Lighting is good. Any more exposure, and you'd lose some detail in the highlight areas. As is, there's a good range betwen light and dark. I really like the decision to make this blue. It's a little more understated than yellow and puts the focus more on the repetition and lines while still adding interest.
Biggest gripe would be the soft focus in the upper left corner. If you had used a different angle so that it was obvious that some threads are closer to the camera then a shallow dof could be useful. As is, it looks like they are on the same plane so it doesn't work to have a section out of focus. The little hairs don't really bother me. You have such great focus in the center, and it IS a macro. The whole point is to show things as they aren't usually seen - beauty in the details - and I think you achieved that.
For this challenge, it's a great shot. However, for a portfolio... I think that you should do some sort of series. I can imagine this hanging in a grouping of 3 or 4 on a well. Each shot being a different color and showing a similar sort of close-up that focuses on texture and lines. Maybe you can keep that in mind and make it a work in progress.
Congratulations on the high score. It's a very simple, clean, and effective photo.
What a pretty shot. I really like the flow of you picture. The soft blue works really nice. The only thing I find disctracting is the little threads everywhere. Still an effective shot. Good luck. Jacko.
Even though this lacks any focal point, it is still a very dramatic macro and I love it. The only thing I might have changed is that you had a little more in focus in the upper left corner. The lighting is fantastic. 8