The author image size there is not changeable, but you can create a single post template with author image dynamic data and adjust the size for your needs.

1) The image is missing in the source.

Sorry I changed the permalink structure during the development. Here it is: https://iatourisme.com/sommet-intelligence-artificielle-et-creation-par-ou-commencer/

https://forum.muffingroup.com/betheme/discussion/comment/253711#Comment_253711

https://www.agrosaat.si/

Link

With a slider element, it might be hard to achieve. Instead, I suggest using the Query Loop with 4 columns set in the style settings.

See the video directly from my phone:

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