First might i say, very nice Panzer in your sig!!!!!!!!!
For painting faces I use Either Model Master enamle Tan or Tamiya Acrylic buff for the base. I use 1 coat of the Tan; for the buff i use 2 coats. then i apply a heavy acrylic wash, (tamiya red brown works great!)
I just started using this technique, and it works so much better than my old on.