Faces are always a tough part of the job. Even with a perfectly sculpted mini, the slightest move at the worse moment can ruin a lot of hard work.
I remember that I spent quite numerous tries on Hadrathus and 'classic' Belit heads with no luck, and I finally gave up. Well, one can't win every single battle, not even Conan. Furthermore, what's important is to win the war, and this is something you're very close to, I guess, seing how much new miniatures you've posted since the last time I've checked.