You actually don't need to right click on it to bring it up full size, just click on each image and it comes up full size, like any other photo. Then you can right click and save it to your computer, as you say. OR, you could just "star" the post so it's easy to find again.
@Joannabanana did you ever get around to submitting this as an article? In your copious free time, that is.