The link I have attached is a simple way a teacher can take images and allow their students to explore and study them in a free and safe thinking environment. One thing I found particularly helpful in my link was the open ended questions they included to help teachers that are integrating VTS for the first time. Already I am thinking of ways to include this concept in the social studies unit I am teaching right now.
http://www.castellaniartmuseum.org/assets/Images/Documents-pdfs-applications/All-Lessons-VTS-Resourse.pdf