Before a recent disc crash I was getting pretty good results by making a head in a 3D modeller (Animation Master) which fitted the photo I wanted to use, then exporting as OBJ and using as a prop in Poser, replacing the standard head. I had to build a UV for the prop using UVMAPPER, re-applied the photo to the UV map and used this as a texture in Poser. You lose the ability to pose the face (unless by morph targets) but at least it looks like somebody real, and not the standard Poser face. When I get my machine back together I'll give it another go.