Hi @artdivision
If you set the Return Value option to “Image Array”, You should be able to do it like this:
<?php
// get the image
$image = $last_row['Image'];
// get the medium image
$size = 'medium';
$medium = $image['sizes'][ $size ];
$width = $image['sizes'][ $size . '-width' ];
$height = $image['sizes'][ $size . '-height' ];
?>
<img src="<?php echo $medium; ?>" alt="<?php echo $last_row['Title']; ?>" width="<?php echo $width; ?>" height="<?php echo $height; ?>" >
This page should give you more idea about it: https://www.advancedcustomfields.com/resources/image/.
I hope this helps 🙂