searxng/searx/templates/default/result_templates/images.html

<div class="image_result">
    <p>
        <a href="{{ result.img_src }}"><img src="{% if result.thumbnail_src %}{{ image_proxify(result.thumbnail_src) }}{% else %}{{ image_proxify(result.img_src) }}{% endif %}" title="{{ result.title|striptags }}" alt="{{ result.title|striptags }}" /></a>
        <span class="url"><a href="{{ result.url }}" class="small_font">{{ _('original context') }}</a></span>
    </p>
</div>