Creating condition for threadbit

[993ti]

I'm trying to create a new condition so i can show an image when the img tag is used on forumdisplay similar like the trashcan (when a post is soft deleted) and paperclip (attachments).
I know that i need to edit the threadbit template but i don't know how to use a condition or how to create a custom one to show a small image when the img tag is used.

See this for an example of what i wrote for my phpBB forum.
Notice the camera's, they only show when the img tag is used in the topic.

Maybe i don't need a new condition but i tried a few options and none worked
Any help is appreciated.