The images are like the rss, they have the same opacity and on hover become normal full opacity.
The plugin comes with a template and a .css template, so you can easily customize it and switch the opacity for example.
There are by default 4 images, you can enable / disable each one individually, and you can set their link, and their image path.
I've used the template hook: ad_below_content, the .php file from the plugin is where you can change the location if needed.
(the same image was used in the example, clearly you can change these)