When you click on a photo for an individual that will generally take you to a person's page. When you click on a group photo you'll get an image page. If you hover your mouse over the individual their name will be displayed. If you click there, you'll be taken to their person page. (Unless they are not included in this site, e.g. still living.)

The arrow in the top left of the thumbnail will take you to the image, as does clicking on the photo. The square box next to the arrow will display the full size image and let you browse through the images.