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Your {{ value }} for that second element should be a path (relative or absolute) to an image resource. If this data is defined by a model within your Django project, make sure the field is set correctly in models.py–it should be a FileField or ImageField. With those, you get a callable URL property. Then in your template, something along these lines:
<table>
{% for row in data%}
<tr>
{% for value in row %}
{% if value.url %}
<td><img src="{{ value.url }}" alt="..."></td>
{% else %}
<td>{{ value }}</td>
{% endif %}
{% endfor %}
</tr>
{% endfor %}
</table>
Source:stackexchange.com