You know those photos you've added to listings on openmikes.org? If you decide one's got to go -- it's an ad for a long-past featured performer, or your drummer didn't approve that particular likeness for public display -- you can just head to your profile page, scan the "Your Photos" list down the left side, and click the little [X] next to that particular photo.
You can't "undelete", so be careful. Of course, you can always just upload the picture again.