Product images in the right and left columns are turned to display:none by default, so they won't display in panels that you've moved to the right or left columns. To turn them on, you can do so by editing the styles.css file for your template. The relevant line is:
.Left .ProductList .ProductImage, .Right .ProductList .ProductImage {
display: none;
}
If you change that to "display:block" I believe you'll be getting the effect you're looking for.
You can edit the stylesheets using the built-in HTML editor in Design Mode by right-clicking anywhere on the screen and choosing "Edit Stylesheet" or "Edit Layout".
Alternatively, you can edit the file by downloading it to your local computer. The file is located at:
[store-location]/templates/[your-template-name]/Styles/styles.css
