The {SCOpenGraph ...} tags should work on any page you use them, including the JReviews listing details.
As for the images, the JReviews Open Graph plugin currently 'asks' JReviews for the images associated with the current listing and then inserts those as Open Graph images. Are you using those map markers as images in your listing details, or are they pulled from somewhere else?
Looking at your restaurant listing, JFBConnect seems to be pulling out the image as:
miraargentina.com/images/jreviews/_canel...ant-1-1340221136.jpg
However, looking at the HTML, the actual image is:
miraargentina.com/media/multimedia/fotos...ant-1-1340221136.jpg
How are you adding those images to JReviews? It's possible we're grabbing those images incorrectly and just need to upgrade our Open Graph plugin.
Thanks,
Alex