To clarify a bit . . . The images you see within the demo versions of JATC Templates and JMTC Themes are purchased via individual licenses by JoomlArt – for use only by JoomlArt for the demo versions. The license does not allow for JoomlArt to redistribute the images within the download packages. Instead, the JA Developers include image placeholders (within the quickstart + sample data download packages) to depict the images and the sizes used within the demo.
As Saguaros mentioned above …. if you want to use images within those places, you will have to use/obtain your own images.
Hope that helps to clarify.