Profile: timB

Problem:
How to change product variation image when a particular variation is selected from the dropdown, in WooCommerce Variable Product page.

Solution:
1. It's a builtin option of WooCommerce where you can specify separate image for your each Product Variation and it does change with the dropdown selection.

- Please see this video (specifically after 2:00 min), select video title link named as “Variable Product Overview”:
https://docs.woocommerce.com/document/woocommerce-guided-tour-videos/

- Screenshot: https://d7j863fr5jhrr.cloudfront.net/wp-content/uploads/2017/01/484269-Variable_Product_Images.png

2. Furthermore, if you want to choose product variations by clicking on image thumbnails, basically it's not possible with Toolset to select variation value by clicking on thumbnail.

But you can use any of the following extensions:
https://codecanyon.net/item/woocommerce-variations-images/17780604
https://codecanyon.net/item/openswatch-woocommerce-variations-image-swatch/12696014

Relevant Documentation:
https://docs.woocommerce.com/document/woocommerce-guided-tour-videos/