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Hi Roberto Reif,
This is a security feature of the browser. The problem is that your tableau server is loaded securely over https (good and secure), but browsers don't let other resources (like images) load on the same page if they are not loaded over https.
A couple options:
1. Change the server that hosts the images to support https, then change the urls of the images so they use https instead of http.
2. Work around it in your browser. Every user looking at the viz would have to do this as well. Details for different browsers: Allow Mixed Content in Browsers | Blackboard for Students (Learning Management System) | How To Guides
I also would advise you to read this great tip from Tyler: