1.  Add ImageFile() field to model.
2.  Add width and height fields to model.
3.  Define form from model, exclude width and height.
4.  Define MEDIA_ROOT _and MEDIA_URL_ in settings.py.
5.  Define view to create a form from request.POST _and_ request.FILES,
    check form is valid, and save form.
6.  Define template to include an img tag, with src="{{ object.image.url }}",
    alt="{{ object.image.name }}", width={{ object.width }} and height similarly.