How does Sandra Brown use imagery in Long Time Coming?

Imagery:

"Marnie wanted to cross the room and slap both of them very hard, an urge that stunned her, since previously she hadn't believed she had a violent bone in her entire body. The one and only time she'd ever spanked David, she had cried harder than he."

"You came into David's life bearing gifts. You're larger than life, magnificent, like some god. Parenting is easy when you're not the one who changes diapers or stays up all night with a kid's earaches. You never had to discipline him while your heart was breaking for having to. No, you missed all that, didn't you?"