I don't know if you know how to use texture maps or not,but assuming that you may not,go into render materials and see what texture map is loaded(if there is none thats o.k.)once you've determined what texture map it is,open the map outside poser in whatever graphics program you have.(posers texture maps are in the metacreations folder /poser4/runtime/textures)put your facial image over the existing texture face and align it as close as possible and save the file as whatever you want.then in poser go back to the render materials and under the texture section apply your texture(tick the apply to all window)I hope this helps,it may be worth it to go to the strike a pose texture link over on the right ,also the tutorials section will have more advanced methods.