If your file is a model field within a model, you can also use ".url" in your template tag to get the image.
For example.
If this is your model:
class Foo(models.Model):
foo = models.TextField()
bar = models.FileField(upload_to="foo-pictures", blank = True)
Pass the model in context in your views.
return render (request, "whatever.html", {'foo':Foo.objects.get(pk = 1)})
In your template you could have:
<img src = "{{foo.bar.url}}">