Hello ucef, I'm not a teacher, but I hope my advice helps you.
When I study essays, I realize that it's not easy to write about broad subjects such as poetry. There is a lot to say about poetry, and I have a college level textbook containing information on how to write essays on poetry. It's a very, very thick book. :P
I'm going to be very vague. Poetry is just like prose. Poems have words, which are usually combined to make a logical vision or story. The distinct difference between the two is that poetry speaks from the soul; thus, they're spiritual. Poetry is also considered to be more condensed than prose.
If you are looking for more detailed information, I recommend reading the Writing Essays about Literature by Kelly Griffith. It's an excellent book that will improve the content of your essays and your understanding of the language arts.
Student or Learner