I realized while doing this one that most of these tutorials are really just the little tricks I've figured out that help me put things together - so I hope they help you, too!
The planes for this one are super simple - generally I just draw the edges of the forehead, then the cheek lines to the chin and the mouth. Those lines defining the cheek are so quick and useful I can't even.
I know I didn't get into much detail with positioning the neck but that would have required EVEN MORE LENGTH.
I feel like going back over these someday and tightening them all up, but for now, enjoy. Hope they help bring you many splendid portraits!