How does Harold C. Livesay use imagery in Andrew Carnegie and the Rise of Big Business?

Imagery:

"Faced with such mixed reports, the Carnegies clung to Scotland as long as they could despite their dwindling fortunes. They finally left because conditions at home became intolerable, not because opportunities abroad were irresistible."

"Scott provided Carnegie with the strong father figure he had never had. They had much in common: a poverty-stricken childhood lacking in paternal leadership, a restless drive to succeed, an ability to master detail, a charismatic personality, and a determination to acquire through self-education the culture and urbanity that circumstances had denied them."

"Beneath the braggadocio lay a cold, hard realism."