get image on tag list of items

Hello,

Sorry for the very poor title of this post, but I don't know how to say what I think of in English :blush:
My problem is :
When you click on the "tag" link below an article on my website, you get a list of articles sharing the same tag, but this list is almost allways free of images... And I don't get why ???
I always put images in my articles, so I guess it is a param I don't know how to use...
Here is a URL to see what I am talking about:
www.rouchenergies.fr/site-content/tag/123-yutampo.html

As you can see if you follow one of the 9 links on this page, all of the articles do have image. (and not oly the 2 with a picture on the list)

Pleeeeaaaase... where is the parameter to change this behaviour???? :blink:
Thank you

Flo

in link to tag you can choose template and check image field in good position i think

Yes I'm quite sure of this, but I can find it... Where is it?
I mean: where am I supposed to look at in the admin?
I had a look in configuration/tags, menu/site content, .......... but could not find where this parameter can be changed.
Any clue please?