If you specified that product images should be displayed at the variant property value level, you can assign a separate main image to the product for each value. For example, you can assign a separate image to each color.
To manage images for variant values:
On the Catalog tab, navigate to the product whose images you want to manage.
On the product’s Media tab, select a variant value from the drop down list.
By default, Always Shown is selected. This means that the same image is displayed for each of the values.
Note: If you uploaded a ZIP file of images that were automatically assigned to the product, those images are assigned to Always Shown. See Automatically assign images to products and collections for more information.
To add an image for the selected value, click Add Images and select either Upload New or Media Library.
Select an image to upload or assign.
You can assign more than one image to each value.
Repeat steps 2 through 4 for each value that requires images.
Click Save.