Hi again
You have Blog Layouts on frontpage with 2 leading articles.
Those images are intro images on joomla! article.
Joomla! 2.5 allows you to set 2 different images on article. The intro image and the full article image.
screen.png
If you want to not use frontpage blog display, you need to populate "mainbody" position on "home" link with some module. For example, on our demo we used News Show Pro GK4.
Cheers