There are four standard view types: large, medium, small, and swatch. You can represent each product with multiple images per view type.
You define variation attributes for base products by navigating to site > Merchant Tools > Products and Catalogs > Products > product > Variations tab.
You define image settings for the storefront catalog by navigating to site > Products and Catalogs > Catalogs > catalog > Edit > Image Settings tab.
See Configuring Variation Attributes for Image Assignment.
You use the product variation attribute value to identify the images for a variation product. For example, you can use "red" to identify the images of the "red variation product.