Not happy with how I've been drawing heads, I've decided to challenge myself by drawing 100 head abstractions in a short period of time. This goes along with the 100 Head Studies, 100 Heads and Hairstyles, and upcoming 100 Hand Studies. Anyone who wants to also take the challenge is invited to post their drawings here, also.
There are numerous head abstraction models and methods you can use. Pick whichever one seems appropriate to you. Mine is based on a few different types, but modified for my needs.
I can't tell you how much it has been helping.
I've combined the three threads into one, by request. Things won't be as clean-cut and defined, but oh well. I guess this will be the 300 Heads thread.
Added a few more pages of heads (the blue ones) on 11/18/05.