Image tagging system sync with WordPress comment system. Or also known as image notes, or image annotation.
Make nice notes with WP-Note in your post.
Post & Page Notes, shortly PPNotes is a plugin to simply at a header and footer to your posts and pages, without editing your theme.
Adds a simple 'Post-it' widget to the Dashboard that allows you to leave yourself or other authors a note.
For me, it's the place to keep notes about future articles, possible topics, plans, ToDos connected with that particular WP site.