Hello,

Such attributes as color or size usually may have a few variables so we can configure them as a drop-down or attribute swatches. In order to configure attribute swatches, please follow these steps:

1. Dashboard -> Products -> Attributes -> Color -> Configure terms;
2. Enter each Variable and set сolor or image which will be shown as a swatch;
3. Configure the variable product with the attribute;
4. Navigate to Theme Settings > Shop > Attribute swatches > choose pa_color (your color attribute)
5. Use images from product variations – means that instead of colors attribute swatch will take featured images set for each variation.

If you also want to set the size as an attribute swatch follows step #1 and enable swatch as shown http://prntscr.com/jskm29

You can also view this video tutorial: https://xtemos.com/docs/woodmart/variable-products-swatches/

Best Regards