ACF Select --> Image

<?php
$images = array(
  'icon1' => get_template_directory_uri().'/assets/img/icon1.png',
  'icon2' => get_template_directory_uri(). '/assets/img/icon2.png',
);
$values = get_field('icons');
if (is_array($values)) {
foreach ($values as $value) {
  ?>
  <img src="<?php echo $images[$value] ?>" alt="">
  <?php
}
}
  ?>