How to describe a visual stimulus?

I personally really like this oral assessment. It provides great opportunities to push students to use and extend their vocabulary and grammar.  It also requires creativity and imagination from students. However, skills regarding how to describe the visual stimulus need to be taught explicitly. There is a lot of information on the visual stimulus and where should they begin? How can students present information in a logical manner? In order to support my students to describe a visual stimulus effectively and be successful for their interactive oral assessments, I have created a document to guide them in this process. 

Great photos can be found via the follow websites.