It is hard to find that one image that tells your entire story, especially when writing fund raising presentations for technology startups. This one comes pretty close: “Dont’ lose your contacts when you drop your phone”, and ad by Indian mobile phone operator Airtel for a phone address book backup service.
See how the composition of the image creates an enormous depth of field. Although it might clash with a minimalist approach to design, I would put the message in a big bold title on top of the image if I were to apply something like this in PowerPoint. Over-communicating is better just to make sure that everyone gets the point.
A larger image can be seen here on Ads of the World.