Only one picture in a person's media album can be designated Primary and that is the one that will be printed. Your options are to:

1. Make a composite image of the images you want, add it to the person's media album and designate it primary, or
2. Use the Report > Publisher tool to make a book incorporating the narrative report and the scrapbooks of the persons you want. Multiple images can be designated for inclusion in a person's scrapbook.