Hi Rebekah
You could try these suggestions:
1 – link those first three posts using the Presentation Page Columns
In Tempera Settings> Presentation Page Columns, select the source of the content and how many columns you want in the row. Make sure that you have an image in each of the source posts.
2 – If you do the above, you will get an image for each post.
3 – Presentation Page> Show Posts on Presentation Page> Enable and then add Number of posts: 1
Post Excerpt Settings> Home Page> Full Post
That’s the best I can come up with 🙂 Hope it helps.
~ Wayfarer