http://www.pinterest.com/characterdesigh/character-anatomy-head/ That site is a giant bin of amazing resources, scroll a bit there’s some really wonderful grid systems to breaking down faces, which you can use for changing the view. Think about features of the face being along straight lines, if you tip one way, everything has to stay following those lines across the face.
I don’t have any terribly insightful things to say on this topic! Study from photos, and from life. My favorite is to sketch actors from movies on Netflix.