You can create a model instance method with another name, allow HTML tags for its output and add this method as a list field. Here is an example:
First add a new method returning the HTML for the image inclusion:
class Article(models.Model):
...
def admin_image(self):
return '<img src="%s"/>' % self.img
admin_image.allow_tags = True
Then add this method to the list:
class ArticleAdmin(admin.ModelAdmin):
...
list_display = ('url', 'title', 'admin_image')
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