What is an example of imagery in the novel, All Fours?

Imagery:

“I walked around Monrovia in a red shirtwaist dress and white wedge heels. The commercial areas weren’t really built for walking, but there were some nice residential neighborhoods. Several times I passed teenage girls wearing backpacks, their breasts inflated by the hormones in cow’s milk and barely covered by tank tops. Whenever I saw them coming I pretended I was from another country, projecting the air of someone so foreign she could not understand or be hurt by anything American” (44).