Can I add images to the node ? and be showed in the UI ?
Sure, just use the Image element.
Some samples demonstrate this. OrgChart shows images that are embedded resources. BeatPaths shows images from our web site.
But your example’s images appear to be diagrams too. You can implement them as subgraphs held by Groups, using different node and link templates. Of course, that’s more work than just showing an Image, if showing existing images is all you need to do.