Hi @tuanphan,
Thanks so much for your help here, I really appreciate it. Some of the suggested CSS have worked perfectly (the original aspect ratios on the product list page for example look great - https://www.brunswickartgallery.co.uk/art) but the images on my product page are still all defaulting to the same size despite them being different aspect ratios (e.g. https://www.brunswickartgallery.co.uk/art/p/clay-sinclair-i-am-ur)
This is all the custom CSS I have added since reading this article.
Any help getting the images to appear with their original aspect ratios on the product page woulud be much appreciated.
Many thanks,
George