Configurable product images are not changing when select different color. I have configured a attribute "Color " with visual swatch type, but on color change image is not changing on product view page.
Can you check if the configuraiton of you product is ok? http://docs.magento.com/m2/ce/user_guide/catalog/swatches.html
Also, are you using some custom theme? Can you check using Luma theme?