How does Holly Black use imagery in The Field Guide?

Imagery:

"It was more like a dozen shacks had been piled on top of one another. There were several chimneys, and the whole thing was topped off by a strip of iron fence sitting on the roof like a particularly garish hat."

"As he held up the makeshift lamp, Jared saw that something had been scrawled in the dust of the desk. Something that wasn't there before. Click clack, watch your back."

"On the yellowed paper was an ink drawing of a little man, posed with a feather duster made from a badminton birdie and a straight pin."