Hello,
First of all thanks for choosing our Theme, we are glad to be you in the WoodMart WordPress family :-)
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The Product Images are controlled by WooCommerce and our theme doesn’t influence them. Woocommerce provides some settings for images that you can find under Appearance >> Customize >> WooCommerce >> Product Images.
Screenshot for Clarification: https://ibb.co/qm7jjmS
You can upload the images in bigger size and adjust the crop accordingly.
You can use optimized images to load them quickly.
If you want to ask anything else then provide some relevant screenshot with the maintenance free URL of the website to check it myself and help you out accordingly.
Best Regards.