"special" product image

Hi.
I post this because it can be a useful feature for others developers.
In the same time I ask for help to complete the feature.

In the "product page" I would like to have una image as a sort of "special image".
The image have to be positioned as indicated by the green arrow in my attachment.

I believe the best thinghs to do is to dedicate one of the product images to this purpose.
For example: the first image (order number 1) is the "main one" (as it is now). The second image (order numer 2) will be the "special one" (as I wish) . The other images will be displayed at the bottom of the main image (as it is now).
To do that, first i changed this code in the Display -> View -> Products / Show_block_img, in order to disappear the image number 2.
It works!

<div id="hikashop_small_image_div<?php echo $variant_name;?>" class="hikashop_small_image_div">
<?php
if (!empty ($this->element->images) && count($this->element->images) > 1) {
$relatedImageNumber = 0 ;
foreach ($this->element->images as $image) {
$relatedImageNumber = $relatedImageNumber + 1 ;
if ($relatedImageNumber != 2)
echo $this->image->display($image->file_path, 'hikashop_main_image'.$variant_name, $image->file_name, 'class="hikashop_child_image"','', $width, $height);
}
}
?>

Now, let's face with the hard thingh.
I need to display the image number 2 in the position pointed by the green arrow showed in my attachment.
To do that, I go in Display -> View -> Products / Show_reversed
and under <div id="hikashop_product_left_part" I tried to put some code but I was unable to succeed.
Any help?

Obviously, you're right! I lost the simple way. Thanks