Subject: The Boy (Singular)
Verb: The word HAVE (Singular)
Pronoun: The word THIER (Singular)
There is subject verb agreement.
I feel that Auden's poem creations a more powerful and emotional response in the reader becuase, I feel, you can describe a subject better or deeper with words than with a painting. I think it takes a little bit of skill to completely understand what the author is feeling when viewing a piece of artwork. The initial understanding I got from the painting was that people are unaware of other's suffering because they are too involved in everyday life, but Auden's poem digs deep into the subject that people are unaware of other peoples suffering when it is indeed going on.
Add a comma because it separates the two sentences.
