I was trying to adjust the page even after I made this post. I just checked it again today, and now there is no image in the "masthead" position on the page. I am at a different computer today so the problem may be with caching. I did clear the cache on my browser and in the backend of Joomla, but not the computer itself.
I think the man in a suit is the default image for a page without another image assigned, and I just could not remember how I fixed it before, so I asked for help.
Thank you for responding. BTW, I can definitely live without the image in the "masthead" position on that page... and probably many others too... 🙂