I've challenged myself to come up with a 100 different facial expressions "played out" by one of my characters from the Caldyra Novel.
Instantly gained a lot of respect for comic book artists and 2D animators who need to redraw the likeness of a character time and time again.
I feel there is still lots to improve and often the likeness I ha din mind is not prefect (but rest assured, I did make a lot of edits)
There is still 20 left on my list that I want to do, to complete it to a 100. Will update it when it's complete.
Learned a lot about the movement of the facial muscles, general anatomy and eyes... damn.. eyes...
I once started a 100 Material challenge form which I learned a lot, i commend doing this one too! Feel free to use the words I've used.
http://suzanne-helmigh.deviantart.com/art/Material-studies-346109337