There are some serious logistical issues around adding this feature. One option would be to hold any post with images until someone at renovateyourworld.com or a moderator could review the content and then make the post active once it was screened. A less favorable option is to just check post with images and have administrators and moderators delete questionable content.
Either way it would require additional resources. I appreciate your concern and everyone at renovateyourworld.com takes this issue seriously.