I recently finished a face drawing project with my Grade 8's. This is the first year I've taught this class, so I started from the basics and had students copy facial features from magazine photos. We started with eyes, (I did a demo on the board for each feature), then the nose, then the mouth and finally ears and hair.
I then go through the basics of proportions.
For the photos to use as reference, we went to to the computer lab to choose portraits to print off. I encourage kids to choose front facing photos with fairly neutral expressions- this is easier for beginners, in my opinion.
Print out full size photos so kids can really observe the details of the face and understand the proportions.
I find this age group is really ready to draw realistic faces are are very engaged with this project.
We drew the good copies in pencil and tortillons (blending stumps) were available for students who like to blend with these.
Here's some sketchbooks showing facial features practice:
Noses- less is more.
Working on their good copies...
I was really happy with the results- the class really worked hard on these.