To make your picture be seen to all users of SPLMS enter course, click “View All Site Content” and enter the picture library you want to make visible to other users.
Then choose settings->Picture library settings in the top menu.
In the permission and management section enter “Permissions for this picture library”.
Press “New->Add users” to create new user group and click “Add all authenticated users” link to add all users to the group.
Give read access inside the group properties.