I recall having similar issues in Fallout 3. You can try changing bLoadFaceGenHeadEGTFiles=0 to 1 in your fallout ini. It's not an ideal fix as far as I know, but it helped me.
The correct fix I believe is to export textures alongside the mod, from the GECK. Never worked for me, or I could never do it correctly.
This is of course assuming there isn't actual face-body mismatch in the mod itself. Wouldn't think so considering how popular it is.
Good luck.
EDIT: Correct ini to edit might be FalloutPrefs. Wish I could test it right now... In any case you can try and see which works. Remember to toggle archive invalidation.