View Multiple Document Libraries together

To complete on what jcgonzalezmartin mentionned:

The approach I would use for this is to setup your image libraries with a few columns to add metadata to your images so they can be classified / found.

From there, I would use a Content search webpart (CSWP) to query the (multiple) image libraries and exclude all other content. An alternative to the CSWP would be to setup a result page in your search center.

On your CSWP or result page, you then need to configure the display template to suit your needs, either displaying the image directly or some info about it and having a thumbnail available on hover. The main advantage I see to the result page approach is that you can also setup a Refiner webpart that your users can use to reduce the number of results for a specific search.

The key to the success of this kind of project is to have a well thought of metadata architecture that your users understand.

Regards,