If you're like me, you're always looking to find engaging ways for students to interact with the images they're viewing. This is a worksheet I give students before introducing them to Picasso and it's gotten great results - - rich responses and students remember the work more clearly because I've asked them to sketch it out.
One thing you will need is a variety of portraits by Picasso, which perhaps you have. I have saved many from art magazines over the years so they're laminated and at tables for students to pick from. Of course, you're welcome to structure this to however you see fit for your students.