Ok. So the first thing I did was study some expression sheets that had that a good sense of volume. I painted them with value to force myself to think about volume and to get quicker by using a time limit for each bust. (You mentioned earlier that I am definitely not fast, and that has really stuck with me. I'm trying to force myself to produce more efficiently.)
I also got a copy if blender and Maya, but it is going to take a long time to get good enough with those to model busts. So I bought some sculpy and made primitive busts.
Then, I've fixed some errors with my previous design and drew more 3/4 expressions.
More action poses
And Lastly, here are a few more sham designs that I was playing around with.
