I would like to see the filter set to both for guests (people not logged in)
and we have always wanted a feature where the owner of the image gets an email notification when someone leaves a comment on their image. This would need a setting/field in their profile enabling or disabling it, disabled by default, just so we cut down on emails that aren't necessary.
Basically, if the owner of the image has the setting on, every time someone leaves a comment on their image, they would get an email along the lines of:
A new comment has been posted on your image: (Image Name)
You can see all of the comments here:
(Link to the Image Page)