You can display attached images in a comment in JIRA out of the box.
This post explains how to do so, no plugin required.
I think the JEditor plugin will let you do this? It looks like it does, I haven't tried it though. There may be some other Rich Text Editors out there for JIRA that do this, but this is the only one I know of off the top of my head.
If you are hosting yourselves, this is an option JEditor is unsupported in our OnDemand environment.
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