He might have exported it to a .obj in a modeler in the wrong ratio.  IE you set it to be .50 when it should have been .25.  That's usually what happens to me.

If that's the case, tell him to reload the head geometry from the zip.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)