{% load wagtailimages_tags %}

<div class="col-md-6">
    {% srcset_image value.image width-{690,345,1380} sizes="690px" class="img-responsive img-border-left" %}
</div>
{% if value.caption %}
    <div class="col-md-6">
        <span class="caption text-muted">{{ value.caption }}</span>
    </div>
{% endif %}
<div class="clearfix"></div>