If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
The image is getting resized to 619px wide and the theme is then using that filesize: http://www.lapenseemultiple.fr/photographies/Brice-Challamel-Calligraphy-619×930.jpg
Check your functions.php file and see if the featured imgSize is set to use that width instead of the default 765. If it is, you can change it back and then save the file. You’ll need to regenerate your thumbnails to get the image regenerated so that it won’t be stretched but that should fix it. http://wordpress.org/extend/plugins/regenerate-thumbnails/
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