The chapter on head modeling from Angela Guenette's Blenderella video training is now available free of charge from the Blender Cloud. That's 15 lessons for free! Enjoy.
About the Author
I have a LONG history with Blender - I wrote some of the earliest Blender tutorials, worked for Not a Number and helped run the crowdfunding campaign that open sourced Blender (the first one on the internet!). I founded BlenderNation in 2006 and have been editing it every single day since then ;-) I also run the Blender Artists forum and I'm Head of Community at Sketchfab.