Use your new-found drawing and painting skills to illustrate your essay. Make at least two visual images. Architecture needs to be covered with at least a plan and an elevation. Two images is a minimum, use as many as you like to illustrate and amplify your written observations. As analyses, they should exaggerate those elements which have the dominant role in the image.
Brevity is the soul of wit.
Six to twelve pages of text is a fair guideline based on past performance. Footnote as necessary. Be very careful in the use of quotations. This is actually a very short paper and to use space quoting someone else takes away from what you have to say. It is better if you digest the import of the quotation and then paraphrase it.