Here's the second test I did based on some tips from John K's blog.
This time I actually used one of the examples he showed.

You can see my process I used for constructing the head, and how I tried to think about it in a 3D space.

I feel like drawing using a tablet is somewhat limiting, as I don't have as much control. This probably would have come out better, had I done it traditionally. Perhaps for my next test I'll try doing it traditionally.