itsjpb Scott like for your user profile? access the user management window (i do it from the button on the pull-down screen), then select the user you want to edit and it should give you the option to add a photo
treequell As @itsjpb says, you can do it from Settings > System > Multiple users. Note that you can't change profile pictures of other user profiles from the owner profile. You will need to have the actual user profile open and unlocked.