Give your writing a thesis statement and a clear, logical structure. Your first paragraph should begin with a powerful lead, include any background information that is required, and conclude with a clear thesis statement. The next paragraph should establish and discuss the similarities between the two artworks. In the third paragraph, explain how they differ and what that means. Finally, give your opinion on the subject. To write about two things compared together, it is necessary to understand their main characteristics and then explain exactly how they are similar and different. For example, if you were writing about two paintings by Pablo Picasso, you would want to make sure that you included his birth date, as well as the dates of his births both in Spain and in France. You would also need to know which countries he lived in during his childhood and young adulthood, when he developed an interest in painting. After establishing such facts, you could talk about how much they resemble one another in style and content. Perhaps one was a portrait of his mother while the other depicted her as a revolutionary heroine. Both images have been cited as influential on the future painter. You would then be able to discuss why these two works are important to Picasso's career and how they reflect his changing ideas over time.