WooCommerce has many built-in options for highlighting products on a website– from image thumbnails in the catalog to product page images (“featured image”) to gallery images.
Even changing the image sizes seems relatively easy. You can make changes to image sizes from WooCommerce Settings> Catalog (see “Image Sizes” at the bottom?)
But… oftentimes, the image size changes do not seem to take.
If you are having image size problems, try installing the free “Regenerate Thumbnails” plugin by Viper007Bond.
Once installed, you’ll find the plugin under ‘Tools.’ Use the plugin whenever you have made image size changes in WooCommerce to force the thumbnails to regenerate. This usually solves the problem.