just a suggestion: product image @ review-order.php

None issue, just a suggestion: WC could also showing product image when in checkout page (as when in the cart). I do it manually with some changes in review-order.php, circa lines 96-100 (WC 2.1.2):

<td class="product-name">
    <?php echo apply_filters( 'woocommerce_cart_item_name', $_product->get_title(), $cart_item, $cart_item_key ); ?>
    <?php echo apply_filters( 'woocommerce_checkout_cart_item_quantity', ' <strong class="product-quantity">' . sprintf( '× %s', $cart_item['quantity'] ) . '</strong>', $cart_item, $cart_item_key ); ?>
    <?php echo WC()->cart->get_item_data( $cart_item ); ?>
</td>

by:

<td class="product-name">
    <?php
        $thumbnail = apply_filters( 'woocommerce_cart_item_thumbnail', $_product->get_image(), $cart_item, $cart_item_key );
        if ( ! $_product->is_visible() ) echo $thumbnail;
        else printf( $thumbnail );
    ?>
    <span>
        <?php echo apply_filters( 'woocommerce_cart_item_name', $_product->get_title(), $cart_item, $cart_item_key ); ?>
    </span>
    <?php echo WC()->cart->get_item_data( $cart_item ); ?>
    <?php echo apply_filters( 'woocommerce_checkout_cart_item_quantity', ' <strong class="product-quantity">' . sprintf( '× %s', $cart_item['quantity'] ) . '</strong>', $cart_item, $cart_item_key ); ?>
</td>

and do some css adjusts.

It’s just a suggestion, and I’m sharing because I think it aggregates value to checkout process and may be interesting to somebody.

https://www.ads-software.com/plugins/woocommerce/