How does Flannery O'Connor use imagery in Mystery and Manners; Occasional Prose?

Example of Imagery from A Good Man is Hard to Find:

"It's not much farther," the grandmother said and just as she said it, a horrible thought came to her. The thought was so embarrassing that she turned red in the face and her eyes dilated and her feet jumped up, upsetting her valise in the corner. The instant the valise moved, the newspaper top she had over the basket under it rose with a snarl and Pitty Sing, the cat, sprang onto Bailey's shoulder.

The children were thrown to the floor and their mother, clutching the baby, was thrown out the door onto the ground; the old lady was thrown into the front seat. The car turned over once and landed right-side-up in a gulch off the side of the road. Bailey remained in the driver's seat with the cat gray-striped with a broad white face and an orange nose clinging to his neck like a caterpillar.