We access the Photos section by clicking on the picture frames icon (second icon from the left in the gray bar at the top of the Plus screen).
The first thing you see are photos from your circles and the first thing you will say is "Huh? Where did all these come from?"
Well, "these" are all the photos, videos, and other graphics posted by people in your circles. Once you have a decent number, there will be literally thousands and they are pretty useless.
It does show who shared them, but generally they are not captioned and you'll have no idea what they are. However, double-click on them and, using the following one as an ...