In Photoshop, open P4 Nude Woman Texture. take your GF's pic, and fit it to size same as the Tiff. Then layer the GF on top of the tiff, carefully lining up the eyes and lips. it will be easier if GF is a little opague so you can see tiff face. The tiff face will be wide, its not wrapped around the head. So you need to spread your GF's face out either with smudge tool or rubberstamp. save as something other than P4 Nude Woman, and once in Bryce, switch the texture with the GF pic. Did that make sense? Ive never tried it with a photograph, but Ive done it with body tatoos and stuff. Its a pretty common practice, but it might take a few errors before you get it right. Now as far as posing the model's face to match the photo, you'll have to ask someone else. Probably a morph and I have never done any morphing.I would use a photo that is pretty straight, no head tilts, no goofy grins, just the face. The tiff will apply it to the pose naturally. Hope this helps.