It's nice to see you providing references with your pictures, as well. I've not seen many people do that. xD
And seeing someone's workflow is always interesting.
I know many people start with the head. Though, I'm one of the few who usually start with the body. It kind of gives you an idea of how big the head needs to be. I for one always run into the issue of making the head too big if I start with it. ^^"