Questions: 1.How does the speaker find Leonardo must have made self-portraits? 2.How many pictures remain there?Do they look alike?Do they fit the age of Leonardo at the time? 3.But how do we know it's Leonardo,and not someone else?Questions: 1. How does the speaker find Leonardo must have made self-portraits? 2. How many pictures remain there? Do they look alike? Do they fit the age of Leonardo at the time? 3. But how do we know it's Leonardo, and not someone else?