How does Roddy Doyle use imagery in Paddy Clarke Ha Ha Ha?

Imagery:

"She went out of the kitchen, beginning to run. She tried to undo the knot of her apron. He went after her. He looked different, like he'd been caught doing something."

"Running through the pipe was the most frightening brilliant thing I'd ever done."

"I looked at Sinbad. He was just my little brother. I hated him. He never wiped his nose. He cried. He wet the bed. He got away with not eating his dinner. He had to wear specs with one black lens. He ran to get the ball. No one else did that. They all waited for it to come to them. He went through them all, no bother. He was brilliant."