Either ban them or let them post normally. This approval stuff is silly.
(If the images offend people they should be changed to links and prefixed with a suitable warning?)
On a technical note, I wonder if it makes sense for an opt-in approval thing for Beehive - like combining worming with an inverse ignore function - so the affected user can see their own posts, but everyone else sees a "you must opt-in to see this post" option, or they can unignore the user to see all posts/threads by them.