Hello,
Thanks for the topic.
At first, I would recommend you to change images settings for all products. Please read this article https://docs.woocommerce.com/document/fixing-blurry-product-images/ To change the size of the product images go to WooCommerce > Settings > Product > Display > Image settings and don’t forget to regenerate thumbnails after changes(use Regenerate thumbnails plugin).
Feel free to ask if you have any questions.
Regards