I have visited your website and the images are displayed of the same quality in which you have uploaded them.
Basically, the product images are controlled by woocommerce and our theme doesn’t influence.
Woocommerce provides settings for the products that you can find under Appearance >> Customize >> Woocommerce >> Product Images. You can try setting the crop settings according to your needs.
If you are trying to ask anything else then please provide with some relevant screenshots of the specific area to check it myself and help you out accordingly.