Compose the introduction and body of your essay; your introduction should tell your readers what you're describing, and the body uses examples, adjectives, anecdotes, facts, opinions, impressions, or a combination of all of these to help readers understand more about your subject.
Reread your introduction and the body of your essay, thinking about the reasons why you chose the subject. Ask yourself some questions as if you were reading about the essay's subject for the first time; for example, what have you learned about this subject that you didn't know before, and why was it important to write these particular things about it? Jot down your answers to these questions.
Write your conclusion based on the answers to your questions in the previous section; don't restate the things you've already said in the introduction and body of the essay, and don't present new facts or observations, but instead find a way to tie together and summarize what you've written about with an overall impression of your subject.