Psychological context:

Interesting answer! Were you cued to choose that one because of the use of the word 'emotion' in the caption?

Did you contrast the facial expressions of the models in the 2 pictures? What do they reveal about their individual feelings and their relationship?

What about body language and clothing? What about other compositional elements?

If I were doing this one I would probably talk about how people could have healthy emotional relationships and that doing so depends a lot on your standing in society (since this is a class on Prejudice and Discrimination).

But how might I develop this contextual analysis by using a psychological theory about relationships?

You might look at the material in the sections "The fantasy life of ads" and "The anxious consumer." Maybe you can add to your analysis.