How does Jeanette Winterson use imagery in Oranges Are Not the Only Fruit?

Imagery:

"So an hour early, we trooped back on to our coach, and joggled home. Three plastic bags full of sick and hundreds of sweet wrappers were our memento to the drive. It was all we could part with." Exodus, p. 34

"He was very proud of that bus, and told of the may miracles worked inside and out. Inside had six seats, so that the choir could travel with him, leaving enough room for musical instruments and a large first-aid kit in case the demon combusted somebody." Leviticus, p. 84