In some of my other articles about advertising design I have referred to what I call the "Photo ID Design Model". This is a very useful device if you create advertising for your company or organization. It is usually the easiest way to create a striking banner or poster. And it will almost always give you a result that gets noticed.
The significance of a "photo id" is that it contains a photograph which is the dominant, or at least the most important graphic element. The other elements on the card -- such as the person's name, address, or ID number -- these other elements "support" the photo. They are not necessarily less important than the photo. But the photo is clearly the main element from a functional -- and therefore from a graphic design -- point of view.