Image thumbnails comes with two icons overlay for image enlarge ( eye icon) and for post link (anchor icon). Hope this is what you are looking for.

Hello,

We are sorry that your changes were reverted back after the update, but if you make changes on the parent theme it will always be reverted on the update.

We will provide you a method with which you can keep your changes safe.

First of all you will have to create a child theme for theme theme you are using currently. You can make the child theme manually or use a certain plugin like https://wordpress.org/plugins/wp-child-theme-generator/ to create a child theme.

Now after you have created the child theme, you will have to make a template-parts folder inside the child theme.

After you have created the template-parts folder, create a file named content-masonry.php inside the template-parts folder.

Now open the content-masonry.php file and inside it paste the below given code

<?php
/**
 * Template part for displaying posts in masonry.
 *
 * @link https://codex.wordpress.org/Template_Hierarchy
 *
 * @package Photo_Perfect
 */

?>

<article id="post-<?php the_ID(); ?>" <?php post_class( 'masonry-entry' ); ?>>
	<?php
	$featured_image_full_url = '';
	if ( has_post_thumbnail() ) {
		$featured_image_full_url = wp_get_attachment_url( get_post_thumbnail_id( $post->ID ) );
	}
	?>

  <div class="masonry-thumbnail post-item">
		<?php if ( has_post_thumbnail() ) :  ?>
        <a href="<?php the_permalink();?>" class="post-thumb">
			<?php the_post_thumbnail( 'large' ); ?>
        </a>
		<?php else : ?>
			<?php
			$no_image_url = '';
			$random_number = rand( 1, 2 );
			$no_image_url = get_template_directory_uri() . '/images/no-image-'. esc_attr( $random_number ). '.png';
			?>
        <a href="<?php the_permalink(); ?>" class="post-thumb">
          <img src="<?php echo esc_url( $no_image_url );?>" alt="<?php the_title_attribute(); ?>" />
        </a>
		<?php endif ?>
    <div class="post-content">
			<?php if ( ! empty( $featured_image_full_url ) ) :  ?>
        <a href="<?php echo esc_url( $featured_image_full_url ); ?>" class="popup-link"><i class="fa fa-eye"></i></a>
			<?php endif ?>
      <a href="<?php the_permalink(); ?>"><i class="fa fa-link"></i></a>
      <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
    </div>
  </div><!-- .masonry-thumbnail -->

</article><!-- #post-## -->

Now you have a child theme with the changes you want.
Similarly, you can also override other templates and functions via child theme.

Hope it helps.
Best regards.