Think of an effective title; by effective I mean something striking and compelling. Why is that? Well, it's the first thing your reader's would see. If you make weak titles, your articles will likely not get any readers at all.
You do not necessarily need references for the BODY because it talks about how you react to the masterpiece. For instance how you see poverty in a painting or depression and so on. This is where you make the readers aware of your own thinking with relevance to the masterpiece you have chosen.
In the conclusion is where you write your realizations or some new learning you want to impart to your reader. This could also include a "CALL TO ACTION". This means that you present in the conclusion what you want your reader to do after reading your essay. You can also make recommendations.
For this specific output, DO NOT FORGET to include an image of the ARTWORK. It would be unlikely to talk about an art that your readers do not see.
References
Cogtas, Jeanille. (18 September 2020). An ALLUSION to the “LAST SUPPER”: An ART RESPONSE. Retrieved from https://www.owupress.com/an-allusion-to-the-last-supper-an-art-response-1325
Writing a Response or Reaction Paper.(2020). Hunter RWC. Retrieved from http://www.hunter.cuny.edu/rwc/handouts/the-writing-process-1/invention/Writing-a-Response-or-Reaction-Paper