How does Olive Ann Burns use imagery in Cold Sassy Tree?

Example of Imagery:

"Grandpa Tweedy was sitting on the porch swatting flies. His pet hen, a White Leghorn, clicked with excitement every time the swatter came down. I guess I saw him through Pink's eyes that morning, because I was embarrassed all of a sudden, how seedy Grandpa Tweedy looked in ragged overalls, his beard so long and scraggly."