As you may have noticed, the portraits added in a portrait section are sorted alphabetically. This can be a bit confusing when you see a teacher's portrait image in the middle of the page, but there is a very quick solution for moving this image so that it is the first portrait for the section.
To do so, simply click on the button near the top of your screen, which will take you to the portrait management section.
From there, click on the name of the portrait you wish to edit and click on the Edit button near the top of the screen. You can then add an * to the beginning of the last name, which will cause the image to be sorted to the top of the class.
Once you go back to the portrait section, you'll see the image is now at the top of the class, and the * character is not visible in the name.