Hi,
You can try with that:
<?php
$imageHelper = hikashop_get('helper.image');
if(!empty($product->images[0]->file_path) && $config->get('thumbnail', 1) != 0) {
$img = $imageHelper->getThumbnail($product->images[0]->file_path, array(50, 50), array('forcesize' => true, 'scale' => 'outside'));
if($img->success) {
echo '<img src="'.$img->url.'" alt="" style="float:left;margin-top:3px;margin-bottom:3px;margin-right:6px;"/>';
}
} ?>
in the file "invoice" of the view "order" via the menu Display>Views
For example, before the line:
<?php echo $product->order_product_name;?>