Images of celebrities are like corporate logos: recognizable from a long distance. When selecting images for your presentation, think of the following:
  • Re-size and crop the images in such a way that all of them have roughly the same scale, and that the eye line more or less lines up
  • Choose active pictures: people pointing, making a gesture
  • Have people look towards the center of the page
  • Harmonize the background (light or dark)
  • Harmonize the color, make them black and white if necessary
I stuck to most of these suggestions (not all) in the example slide below: