Hello,

No, it is not possible to change the image without selecting the other attributes. This is the WooCommerce functionality and we can’t change this behavior.

To achieve that functionality requires customization and this is beyond our limitations and support policy.

You can read and follow the below article that might help you out:
https://wordpress.org/support/topic/variation-image-does-not-show-until-all-variations-are-select/

Best Regards.