[Django]-Django {{ MEDIA_URL }} blank @DEPRECATED

You need to add the RequestContext in your render_to_response for the context processors to be processed.

In your case:

from django.template.context import RequestContext

context = {'latest': p}
render_to_response('Question/latest.html',
                   context_instance=RequestContext(request, context))

From the docs:

context_instance

The context instance
to render the template with. By
default, the template will be rendered
with a Context instance (filled with
values from dictionary). If you need
to use context processors, render the
template with a RequestContext
instance instead.

You can also use direct_to_template:

from django.views.generic.simple import direct_to_template
...
return direct_to_template(request, 'Question/latest.html', {'latest': p})

In addition to question provided above can suggest you to take a look at photologue application. It could help you to avoid direct links in template files and use objects instead.
F.ex.:

<img src="{{ artist.photo.get_face_photo_url }}" alt="{{ artist.photo.title }}"/>

Update: For Django 1.10 users, the both media and static context processors are already moved in django.template from django.core read the following article for more info: https://docs.djangoproject.com/en/1.10/ref/templates/api/#django-template-context-processors-media