Yo that looks GREAT! Really nice lighting and detail all around!
It's good you found a method that works for you. I think we all feel comofortable with different ways of constructing faces at different angles, just matter of trying and experimenting with different techs. Personally I use the 3D heads from CSP for basic angles, references for particular ones, or just outright photos I take for more complex ones.
I can see the skull/box method working well from imagination. Should try it out to see how it works.
