Crop the photo in another programme, such as Irfanview (which is free) then just import the head portion into PP.
You can download Irfanview here
http://www.irfanview.com/
Download the zip file of plugins/addons too (they're free too) and are very handy.
You can download Irfanview here
http://www.irfanview.com/
Download the zip file of plugins/addons too (they're free too) and are very handy.