You asked for an indepth review of your shot in a challenge.
This is a nice macro shot!
Unless I read your title I would have had no idea as to what I was looking at! You did shoot this very well. I am finding that I am tilting my head to make it centered though, so a tighter crop on the left hand side to center it would have helped with this.
You have a good DOF going on here starting at the handle (?) and leading our eyes to the center. You did well with your light bounce as well.
There is not a lot you could have done in post processing that you didn't all ready do, but maybe just a little more contrast to give it some depth.
Overall, the comments that you received are pretty much spot on.
I don't know why this picture doesn't work for me. It's a nice perspective and a decent execution, maybe because it isn't completely centered, maybe more contrast or harsher light would have helped, 5