Facebook sharing showing wrong image

Hi
I’ve got the Story theme installed on my website, which I love, but when sharing the homepage to Facebook – which is using the portfolio mode – the image that is shown is not anything that is representative of the images on my homepage, but rather a PNG of a file I have used as a site ID. I’d love Facebook to pick-up the images being used to highlight my portfolios, but how?? Someone please help. I’ve tried everything, including all the options in the Yoast SEO plugin, but nothing seems to work.

My site is here: https://foraggiophotographic.com