I know it sucks to have to click on their profile, but I don't think adding a "Report" button all over the site where pics appear is necessarily the solution because it will add way too much clutter around the site for something that is not used extremely often.

Maybe a better solution would be to have a Report page where you can manually enter the username of the user you are reporting, so if you see an inappropriate pic and you want to report it without having to go their profile, you could just go to the Report page and enter their username there.

If there's enough interest in something like that, I could certainly build it.