You can customize the product image by heading towards:
Dashboard >> Appearance >> Customizer >> WooCommerce >> Product Image
You will find the following options:
After publishing your changes, new image sizes will be generated automatically.
Main image width – Image size used for the main image on single product pages. These images will remain uncropped.
Thumbnail width – Image size used for products in the catalog.
Thumbnail cropping – Will have the following three options:
1:1 – Images will be cropped into a square
Custom – Images will be cropped to a custom aspect ratio
Uncropped – Images will display using the aspect ratio in which they were uploaded