6A

     Any type of visual can be used as a rhetorical tool. If the visual is used to support or explain an idea or standpoint, it is a rhetorical device. It can draw attention to certain things, just by where certain things are placed within the image, but it can also distract from a truer meaning. Any good author knows how to properly select their images to help support their writing, for this exact reason.
     When comparing and contrasting two images, an author could also use an analogy. For example, they could say that making friends is like taking a bite out of an apple. Some turn out to be better than you expected, while others turn out to be rather disappointing. By painting that image for the reader, they were able to better understand and relate to the author. Where the visuals be compared side by side or subject by subject, all depends on the preference of the writer, and the subject. Whichever the writer decides to use is the right way for them, because that's their best way to relate to the reader.