Try using the following methods to add the face and apply it to the avatar.
Code:
import viz
viz.go()
face1 = viz.add('biohead_eyes.vzf')
face2 = viz.add('biohead_eyes.vzf')
female1 = viz.add('vcc_female.cfg', pos = [0.2,0.3,1], euler = [180,0,0])
female1.setFace(face1)
female2 = viz.add('vcc_female.cfg', pos = [-0.2,.3,1], euler = [180,0,0])
female2.setFace(face2)
f1_l_eye = face1.getChild('geom_0')
f1_r_eye = face1.getChild('geom_1')
f2_l_eye = face2.getChild('geom_0')
f2_r_eye = face2.getChild('geom_1')
female1.state(1)
female2.state(1)