A: A writer of an essay has many possible conclusions at his disposal.
He could end with a question, giving the reader something to think about. He could end with a quotation from a famous author that sums up his essay and brings everything together. He could end the essay with the same sentence he used at the start, to bring everything full circle. He could end with a personal anecdote that clearly expresses the themes of his essay. Any of these techniques would have been more acceptable.
But you chose to go a different route and end your essay with a picture of your engorged genitals with the captain, "Prime real estate available!" Your conclusion is unacceptable and I will not be able to award you a passing grade.
I will, however, take you up on your real estate offer. Are there rentals available, or must I buy? And can I bring friends?