How does Annie Proulx use imagery in Brokeback Mountain?

Examples of Imagery:

“He pressed his face into the fabric and breathed in slowly through his mouth and nose, hoping for the faintest smoke and mountain sage and salty sweet stink of Jack but there was no real scent, only the memory of it, the imagined power of Brokeback Mountain of which nothing was left but what he held in his hands.”

“Late in the afternoon, thunder growling, that same old green pickup rolled in and he saw Jack get out of the truck, beat up Resistol tilted back. A hot jolt scalded Ennis and he was out on the landing pulling the door closed behind him."