The gaze of people in different directions reinforces the idea that we, as individuals, only have a limited perspective on certain experiences (copied text from the image)
Can't really talk about salience as nothing really stands out as prominent (it's just a big mess of a picture to be honest)
Body language (different facial expressions, body languages and gestures)
Contrast in age and portrayal of people (a mother holding her child vs a businessman on a call vs a younger person reading a book, for e.g)
Pretty much, with any technique you can find, try to use the text around the image to reinforce your argument (kind of like what I did with the first example)