Hi @miguelripoll
My guess is that you’ve set the return value of the image field to “Image object” (that’s the default setting). That means that the $pic variable will be an array of the attachments values such as url, sizes, alt etc.
Based on the way you print everything now you’d first need to setup the $pic variable as an actual img tag.
Something like:
<?php
$pic_object = get_field( 'pic', 'user_' . $value['ID'] );
$pic = '<img src="' . $pic_object['url'] . '" alt="' . $pic_object['alt'] . '" />';
?>