For texturing, it was possible to project a face photo onto a face model tool in zbrush 3.1 with image plane, and you would be able to move and stretch the photo refrence to fit your face model, but not anymore in zbrush 3.5 r3. The image plane will not work while projection master is activated in zbrush 3.5 r3. Could someone explain?
Because of the changes being made in preparation for ZBrush 4 and Spotlight the functionality is different. See here for a method you can use with Projection Master:
http://www.pixologic.com/docs/index.php/Image_Plane