category images and templates

[IdentidadVisual]

I'm trying to edit the category.tpl in /listings for the prestashop 1.7 classic theme; I want to put the big category image fully occupying the card where the name and description of the category should be (already commented that in the template)
 
But I'm having problems finding the correct code to pick the big image set for the category; I can only place the thumbnail with:

<img src ="{$category.image.large.url}"

and I've been looking all the morning for same topics on this matter, checked the prestashop documentation, etc... found nothing.
 
Is there a way to achieve this, or do I have to work around it?

[IdentidadVisual]

I finally managed to find the variables (2 months later!!!), in case anyone else is interested, custom image sizes can ve invoked in smarty with:

{$category.image.bySize.custom_size_name.url}