How does Flannery O'Connor use imagery in Collected Works?

Imagery:

"The sun was going down and the sky was turning a bruised violet color that seem to be connected to the sweet mournful sound of music."
Page 201

"The liquor lay like a hot rock in the pit of the stomach, heating his whole body, and he felt himself pleasantly deprived of responsibility or of the need for any effort to justify his actions."
Page 471