How does Maggie Stiefvater use imagery in Linger?

Imagery:

"So here is me, and I am a boy watched - by her parents' suspicious eyes since they cannot prove that I kidnapped Grace but believe it nonetheless - and I am a boy watchful - because Tom Culpepper's bitterness is growing palpable in this tiny town and I will not bury Grace's body - and I am a boy in waiting - for the heat and fruitfulness of summer, waiting to see who will walk out of those woods for me."

"I needed to find a needle to slide under my skin or a pill to dissolve under my tongue. No. what I needed was to be wolf again."