It is easy to add photo on AD users account using following freeware tools:
Option is located under AD users properties ‘Attribute Editor’ under thumbnailPhoto as mark in red below. Hexadecimal value will be entered by the ‘Codetwo Active Directory Photos’ tools automatically under the right AD administrative permission. This photo will be display in MS outlook, SharePoint or any other relevant sites.
(This site contains awesome free tools; Thanks to the CODETWO)