Just been reading Russel Tarr's blog post about a technique he picked up during the #pracped16 conference at school earlier this month. 

http://www.classtools.net/blog/use-an-image-flash-to-engage-students-with-pictorial-sources/

I'm going to try this out with both of my IB classes this afternoon. G12 are just about to start their work on Malthus and his population theory and so I will be using the first image below. The G11's are just starting on the impacts of tourism on one nation and we'll be focusing on Vietnam. Their image is also below. The students are prearranged into groups and then have 1 second to view the image before the analysis begins (see blog post above for full details). Let's see how it goes. 

I've put together a framework sheet for each group to use. It can be accessed by clicking on the blue tab below.