Teaching Self-Portraits: proportion vs. tracing face shapes. For grades 1-4 teach proportion. For grades 5-8 begin by having students trace a picture of themselves onto transparency using vis-a-vis marker. Students tape transparency into sketchbook for shape reference. For grades 9-12 teach both methods and introduce modeling/value
Picasso Portrait Reference with things like this I print them laminate them and leave them on the art shelf for the kids to use and incorporate them as they please. Often with more imaginative things then I could ever come up with.