How does Rachel Seiffert use imagery in The Dark Room?

Examples of Imagery:

"He knows he is fit, feels he has a strong heart and good lungs and swift legs to offer his nation. He also knows he is imperfect."

"They describe an army the size of a continent, angry and brutal and without mercy. These people speak of punishment, and bring with them a faint sense of deserving. As they pass they tell tales of emaciation and ashes, of stinking smoke and puts full of bodies. Some say they have seen these things, others dispute it. Their voices half-hearted, matter-of-fact. Vague, hungry, and weak."