Store your Django image files on Imgur
You cannot store uploaded image files directly on Heroku due to the ephemeral file system; this can cause problems with your Django models if they have file / image fields.
The normal advice is to use S3 or Bucketeer to store your files; both of those are probably better solutions than this (piggybacking on Imgur's API).
You should be able to use it with the following snippet.
from ImgurStorage import ImgurStorage
image_storage = ImgurStorage()
class Car(models.Model):
...
photo = models.ImageField(storage=image_storage)