put this on function.php
//delete woocommerce categories images
<?php
remove_action( ‘woocommerce_before_subcategory_title’, ‘woocommerce_subcategory_thumbnail’, 10 );
?>
//add to function.php
add_action( ‘init’, ‘wc_child_remove_subcategory_thumbnail’, 20 );
function wc_child_remove_subcategory_thumbnail() {
remove_action( ‘woocommerce_before_subcategory_title’, ‘woocommerce_subcategory_thumbnail’, 10 );
}