Portrait Auto Flow arranges all portraits in a section in alphabetical order. This includes teacher portraits. If you want the teacher portrait to be the first one on the page you will need to move it in front of the other portraits.
1. Go to the portraits page that needs the teacher portrait moved and select Portraits.
2. Select Add/Edit Portraits.
3. Find the teacher portrait and click on it. Check the Move to Front box.
4. You can also click on the gear on the portrait on the page to get the same options.