How does Ralph Helfer use imagery in Modoc: The True Story of the Greatest Elephant That Ever Lived?

Imagery:

"As Bram leaned over, his little hand pulled loose from Katrina' grasp, found its way down toward the trunk. A finger extended to meet the tip of the trunk. Bram's expression was one of curiosity; he felt the wet tip, Modoc moved her 'finger' all around Bram's hand, sliding it across each finger and the palm. A big tickle grin spread across Bram's face, Modoc did her elephant 'chirp,' a tear glistened as it ran down Katrina's face. All was well. The future had been written."

"Thump...thump...thump. And from the innermost recess of her being came an ancient primitive sound, a whine of anguish seldom heard by any living thing...uttered only at the time before a kill."