|Jeanne, your eye for composition shows once again, and your focus control on this macros is very good. And the angles on the spools are definitely nice, as opposed to straight up and down.
I do have one composition suggestion: try moving the left edge in so it just touches the orange spool, filling the upper left corner with orange. That'll get the other end of that spool out of the middle and eliminate what my eye perceives as a big border to the left of the orange thread.
More importantly, I think, this lacks contrast. I bet that thread on the right is lot brighter than it looks here, for instance. You mentioned using levels. Experiment with really pushing the contrast to where it looks terrible, then back away, as opposed to slightly tapping it upward from where it starts. Play around - you never know what you might discover. :)