How does Neal Shusterman use imagery in The Schwa Was Here?

Imagery:

"He wasn't good-looking; he wasn't ugly; he wasn't buff and he wasn't scrawny. He was just, like, average. Like if you looked up "kid" in the dictionary, his face would be there."

"They say his eyes change color to match the sky. They say his shoes are always the same color as the ground. They say if you stare at him long enough, you can read what's written on the wall behind him."