Imagery is simply putting what you can imagine into words. What you need to do is imagine that you are in your character’s shoes and look around the room. How would you describe your settings to someone who is blind? Pretend you are their seeing eye dog. It may also help you out to write about how you would react to (or what you would think about) the conditions your character is in.
Did you feel like you were there? What helped you to feel as though you were actually in Michaelangelo's shoes? Hint: Imagery.