How to restore my photo during a Zoom session

At the beginning of a recent Zoom session, the photo shown of myself was as expected. That is, it was the photo associated with my Windows userid. At the beginning of the session I was using headphones, but at some point I needed to get up from my position at the PC, and I switched the audio from headphones to an external speaker. After I did that, the photo shown was the photo associated with my Windows profile.