not to sound harsh or anything but the only thing that this shot convinces me of is using a tripod with a 180mm
Like the previous member posted, the focus is not at the right place and where the focus is, the portion is not what I would consider sharp by macro standards. So, for the focus at the wrong place, either it was not noticed and it is lacjk of experience with macro, either by handholding it, you balanced back and forth too much and did not nail the focus at the right place. The not so sharp in focus area, I would attribute to still a too slow shutter speed- camera shake.
The light is harsh and unpleasing, if it was NL, that makes me believe that there was plenty of ambient light to allow a proper DOF with focus on the font eye that would have allowed you to get the whole face in focus. If it was taken with the 580 with a snout, it shows that the light produced that way is not pleasing for macro work.
I am hoping you can come up with more convincing shots. BTW, I am not against the idea, I have done a few handheld macro shots with my 150mm which should have a relatively similar level of difficulty. But they were stacks of multiple shots at very wide apertures (shooting in NL when it is pleasing early in the morning).
All the best
Martin