Change User Account Picture

Hi there

We're using Office Professional Plus 2013 Volume Licensing Edition on Windows 8.1 Enterprise. Is there a way how i can Change the Default "Grey" User Account Picture in the Office Applications?

I replaced the one in Windows with a Company branded one (GPO) but i can't find any Setting / place where i could replace it for Office. We are using the Domain Account for Office 2013 without Office 365, Lync, etc.

Thanks and Regards,

Simon