/**
 * @snippet       WooCommerce Show Product Image @ Checkout Page
 * @author        Sandesh Jangam
 * @donate $7     https://www.paypal.me/SandeshJangam/7
 */
 
add_filter( 'woocommerce_cart_item_name', 'ts_product_image_on_checkout', 10, 3 );
 
function ts_product_image_on_checkout( $name, $cart_item, $cart_item_key ) {
     
    /* Return if not checkout page */
    if ( ! is_checkout() ) {
        return $name;
    }
     
    /* Get product object */
    $_product = apply_filters( 'woocommerce_cart_item_product', $cart_item['data'], $cart_item, $cart_item_key );
 
    /* Get product thumbnail */
    $thumbnail = $_product->get_image();
 
    /* Add wrapper to image and add some css */
    $image = '
'
                . $thumbnail .
            '
'; 
 
    /* Prepend image to name and return it */
    return $image . $name;
}