We are running Microsoft Lync 2013 and all the clients are Lync 2013.
On the client there is an option to 'Show my picture' or 'Hide my picture'
All the staff photo's are pre-loaded into AD and display in Outlook and Lync; unless the user goes into the Lync client and ticks the Hide my picture box.
Unfortunately not. As you can tell from reading through the link below this is something that many of us who administer Lync have been asking for since 2010. MS has yet to produce a GPO or solution. There have been a few people try some hacks which have not been real successful.
http://social.technet.microsoft.com/Forums/lync/en-US/e2abbe72-8ea3-4f2b-a9de-b7bde77a97b7/disable-do-not-show-my-picture-on-lync-client