<img src="{{Object.picture.url}}"/>

<img src="{{ posts.title_picture.url }}"/>

<img src="{{title_picture.url}}"/>

class Post(models.Model):
    title = models.CharField(max_length=255, blank=True, null=True)
    title_picture = models.FileField(blank=True,null=True)

class IndexView(ListView):
    model = Post
    context_object_name = 'posts'