Please take a look at my site futogrufee.com, I exactly needed to replicate the theme, because that suits my requirement. But I have been trying , but cant able to load in images on Home page except the cover page. Request your attention at first.
After inspecting your site URL, We would suggest you to set Featured Image in all the posts as those displayed images are the featured images of those post.
Please refer this screenshot for detail: http://image.prntscr.com/image/3ae9526605894988b52bea6ede1002e3.png
If the problem still persists, please let us know so that we could debug further.