You can select an image for each page on your website through the page details window. This image will then be shown on social media when the page is shared, usually as part of a preview displaying the page’s title and description too.
You are able to select any of the images used on your website as the image within the page details window, even if these are licensed photos from Getty Images. This is because they will be shown in the context of your website when they appear on social media.