[Answer]-Uploading multiple files in a ModelForm

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If you really want to intergrate thumbnail generation to the model level, use the django-imagekit https://pypi.python.org/pypi/django-imagekit

Example:

from django.db import models
from imagekit.models import ImageSpecField
from imagekit.processors import ResizeToFill

class Profile(models.Model):
    avatar = models.ImageField(upload_to='avatars')
    avatar_thumbnail = ImageSpecField(source='avatar',
                                      processors=[ResizeToFill(100, 50)],
                                      format='JPEG',
                                      options={'quality': 60})

profile = Profile.objects.all()[0]
print profile.avatar_thumbnail.url    # > /media/CACHE/images/982d5af84cddddfd0fbf70892b4431e4.jpg
print profile.avatar_thumbnail.width  # > 100

Although, in most of the cases you shouldn’t be adding the preview to the model, since there are a lot of packages for generating thumbnails on the fly (on the template level) in Django: