Variant Images is a free app that lets you assign images for each of your variants. For example, if a customer is browsing your store and they select a "beige" couch, the main image will change to the photo of a "beige" couch.
This reassures your customers which version of the product they are purchasing and offers a nicer overall user experience.
All you have to do is select which product images belong to each variant and it will automatically edit your theme. It's that easy.
If you are having trouble with your particular theme, fill out this form and we will look into the issue.