<a class="panel-link" href="#" rel="">
    <div class="face-outer">
        <div class="face" style="background-image:url('{{ url }}')" ></div>
    </div>
</a>

<a class="panel-link" href="#" rel="">
    <div class="face-outer">
        <div class="face" style="background-image:url('http://www.gravatar.com/avatar/{{ url }}?r=g&s=140')" ></div>
    </div>
</a>

Add gravatar url parts in the view
Add gravatar url parts in the view
