I took another class on portrait drawing to get some more people practice (who doesn't). The same instructor made the skills practice a little easier and the steps more concrete. I really focused on going light and taking my time--two things I need a ton of work on.
We had two models for two weeks at a time--polar opposites: an older lumberjack and a young, hip woman.
A few nights were a struggle but I was persistent and plowed through the "I don't wannas". Some hardcore hip-hop seemed to do the trick too. Something about Lil' Wayne yelling at you makes you want to push on.