This was a lesson I did with my high school class while they were online. They had to find a photo, cut in in half vertically and then re-create the other side by hand. They quite enjoyed this and it was a good warm up exercise to their next big project which involved drawing a portrait of an influential person from history.
This project is a classic face practice drawing lesson and I do think it's really effective.
Some finished Grade 10 - 12 drawings below: