Hello,

To create a variable product you need to read and follow the below documentation:
https://xtemos.com/docs/woodmart/variable-products-swatches/

As you want to switch the images also with variations. Then after creating all the variations you need to make sure that you have uploaded the images for those variations as well.

Screenshot for more clarification: https://jmp.sh/ceKevbh
Result: https://jmp.sh/zNxcOdT

Best Regards.