"Start with the eyes. Then do the face in whatever shade you choose. Now add a touch of white to the flesh tone to get a slightly lighter shade and go back over the nose and cheekbones. A light orange makes defined but natural-looking lips. Remember, red lips are a product of makeup, not nature. Some painters prefer to put the eyes on last, but others say it's too hard to keep from making the effect pop-eyed when done last. Try whatever method you prefer. Mustaches are best if dry-brushed, paint beards a slightly redder or darker shade than the hair and dry brush with the same colour you use on the hair. There's nothing wrong with a 5-o'clock shadow on an appropriate figure, either. Dry-brush it on in a shade slightly darker than the hair. Once you get comfortable with faces, experiment with scars or tattoos. You might amaze yourself. "
From the link I gave you
. seemed to work for me