How does Dave Pelzer use imagery in A Man Named Dave: A Story of Triumph and Forgiveness?

Imagery:

"Before I left her, I clasped my hands together, then made the sign of the cross and leaned toward her ear, whispering, 'May God be with you, Mrs. Pelzer, for no one else will be.'"

"Every time I zipped up my flight suit, I felt like my childhood hero, Superman, out to save the world from impending doom."