How does Thor Heyerdahl use imagery in Kon-Tiki: Across the Pacific by Raft?

Imagery:

How old he was he did not know, but his wrinkled, bark-brown, leathery skin looked as if it had been dried in sun and wind for a hundred years.

"A sparse little man with a long nose opened the door a crack before he threw it wide open with a broad smile and pulled me in. He took me straight into the little kitchen, where he set me to work carrying plates and forks while he himself doubled the quantity of the indefinable but savory-smelling concoction he was heating over the gas."

The traffic consisted of barelegged goatherds in gaily colored ponchos, driving forward disorderly herds of stiff-legged, dignified llamas, and now and then whole families of Indians coming along the road. The husband usually rode ahead on a mule, while his little wife trotted behind with her entire collection of hats on her head and the youngest child in a bag on her back. All the time she ambled along, she spun wool with her fingers. Donkeys and mules jogged behind at leisure, loaded with boughs and rushes and pottery."