<?php if(has_post_thumbnail()): ?>

<div class="image">

<a href="<?php the_permalink(); ?>">

<?php the_post_thumbnail('tabs-img'); ?>

<div class="image-extras">

<div class="image-extras-content">

<img src="<?php bloginfo('template_directory'); ?>/images/link-ico.png" alt="<?php the_title(); ?>"/>

</div>

</div>

</a>

</div>

<?php endif; ?>

AND remove:

<div class="image">

<a>

<?php echo get_avatar($comment, '52'); ?>

</a>

</div>