It sounds like you are asking for two features here:
- Image annotation
- Image comments
You referenced a plugin for the first, and WordPress supports the second out of the box!
As another choice, in the last link you provided, that person is using Flickr to handle their annotations and comments. This is another great option if you don’t mind the content coexisting on Flickr. There are many Flickr plugins, but here is a solid one that I know supports both annotations and comments. I’m sure there are at least 20 options, and with a little trial and error I bet you’ll find exactly what you’re looking for in a flickr plugin.
I hope this puts you on the right path to finally setting this up!
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