Thanks for the plugin. It's been helpful.
One thing I noticed today though is that if there are special characters (" at least, possibly others) in the description of a picture on Google+, they are not escaped in the short-code. So then you either get a short description or no description (as in my case because the " was at the start of the string). You need to escape these somehow, or change them to single quotes (') or something.
I tried escaping them by hand with a \ and that didn't work either, so I ended up changing them by hand to a single quote. It would be nice for this to happen automatically.
Overall a great plugin. I'd like it a little more integrated and a little more user friendly, but at least now I can get my pics from Google+ in :)