How does Isabel Allende use imagery in City of the Beasts?

Examples of Imagery:

"Even though they were right beside him, they were difficult to see; they blended perfectly into nature, which made them invisible, like stealthy ghosts."

"He had to stay in bed for the next two days, as green as a lizard and convinced that he would die of nausea and the pain in his head."

"It was a paradise and magnificent waterfalls, a vast rain forest filled with the animals, birds, and butterflies, with a benign climate free of the clouds of mosquitoes that tormented them in the lowlands."