How does Jennifer Donnelly use imagery in Revolution?

Imagery:

"I play until my fingertips are raw. Until I rip a nail and bleed on the strings. Until my hands hurt so bad I forget my heart does."

"It's not a good sound. It's like footsteps behind you in the dark or a door slowly opening in the house when you thought you were alone. I should leave it where it is; I know that. But I almost never do what I should."

"I don't like hope very much. In fact, I hate it. It's the crystal meth of emotions. It hooks you fast and kills you hard. It's bad news. The worst. It's sharp sticks and cherry bombs. When hope shows up, it's only a matter of time until someone gets hurt."