{% assign image = nil %}

{% for data_image in site.data.images %}
  {% if data_image.source == include.image %}
    {% assign image = data_image %}
    {% break %}
  {% endif %}
{% endfor %}

{% if image %}
  {% if image.publisher == 'Fotolia' %}
    {% capture image_credit %}© {{ image.author }} - Fotolia.com{% endcapture %}
  {% elsif image.publisher == 'Flickr' %}
    {% capture image_credit %}© {{ image.author }} - Flickr.com{% endcapture %}
  {% elsif image.publisher == 'iStockphoto' %}
    {% capture image_credit %}©iStockphoto.com/{{ image.author }}{% endcapture %}
  {% elsif image.publisher == 'Unsplash' %}
    {% capture image_credit %}© {{ image.author }} - unsplash.com{% endcapture %}
  {% else %}
    {% capture image_credit %}{{ image.author }}{% endcapture %}
  {% endif %}

  Image Credits: {{ image_credit }}
{% endif %}