In the Editor's Layout tab, your composite grids shows cartoon portrait placeholder images.
Should you want to get a better sense of what your composite will look like when it is completed, you can replace the cartoon preview with a photo from your index portraits.
Select a composite grid, then access the Portrait Template option. The Default Sample Images is set in this area.
In the example below, the selected composite frame is set to show the portrait of the homeroom teacher - a specific person in this case.
Use the dropdown to pick a portrait in your index. In this case, the portrait of the actual teacher was selected.
Any portrait can be selected to replace the cartoon samples. In the example project, two student portraits have been selected to display in their grids.
As sample images, they will be replaced when the composite is generated. Only the teacher's image remains the same, since the sample matches the final output.