There are three keys to a quality product here:
First, it is essential that you establish the basic situation for the line or lines that contain the literary device you will be analyzing. What has happened just before? What plot developments are relevant? This should take no more than a sentence or three.
Second, you must D>E correctly. Quote properly and explain your brains out. Shakespeare often has all kinds of multiple meanings and connections to other ideas and plot developments. Unpack metaphors; discuss emphasis. Seriously, say as much as you can.
Third, and perhaps most challengingly, connect to larger issues that are evolving. This can include plot and conflict, character development, motifs, themes, and other imagery, metaphors, etc.