Hi Charlie - Try to keep your geometry even (squares / see below). Remember your not going to smooth this model so you want it to appear as 'smooth' as possible. Working towards an even distribution of geometry will also reduce 'non-planar' (impossible) faces.https://www.filesanywhere.com/fs/v.aspx?v=8b70678e5f5e70aa71a1
Thank you for the references and comments, I will try to fix the geometry and keep the rest of the model as even as possible.
Also see...Also see..http://i2.wp.com/sintelgame.org/wp-content/uploads/2010/10/lowpoly_base_heads-e1287775987923.jpg?resize=533%2C385https://henriquedw.files.wordpress.com/2009/08/final_archeologist_gamemodel_wires.jpg