Formerly known as WooSwatches WooCommerce Color or Image Variation Swatches plugin helps you to convert your existing WooCommerce variable Product dropdown select into nicely looking color image and label swatches. You set color image globally once and plugin automatically syncs whenever you create variable product using that attribute. You can also enable swatches globally sitewide on all product that are created from global attributes. While plugin enables Swatches globally , it also have a flexibility to override color images on per product basis.

Demo: https://www.sysbasics.com/product/wooswatches-woocommerce-color-or-image-variation-swatches/