How does Julie Anne Peters use imagery in Luna: A Novel?

Imagery:

"I'm strangling her. She's not the one I want to eliminate. All this suppressing and holding her down, keeping her caged, perpetuating this fraud, this sham. I can't do it anymore. I can't. It won't go away. No matter how much I wish, or pray, she's always with me. She is me. I am her. I want to be her. I want to be Luna."

Boy by day, girl by night. Except, he was a girl all the time, inside. It was hardwired into his brain, he said, the way intelligence or memory is. His body didn't reflect his inner image. His body betrayed him.