If your product is a variable product and each variation has its own image AND you want the variation image to appear – instead of the main image – when your client selects the variation?
You will need to use the “Woo Product Images Slider” module instead of the “Woo Product Image” module. ( and you can hide the thumbnails from the module settings if you want )
The “Woo Product Image” module only displays the main product featured image.