django imagefield not working code example

Example 1: Django forms I cannot save picture file

def upload_pic(request):
    if request.method == 'POST':
        form = ImageUploadForm(request.POST, request.FILES)
        if form.is_valid():
            m = ExampleModel.objects.get(pk=course_id)
            m.model_pic = form.cleaned_data['image']
            m.save()
            return HttpResponse('image upload success')
    return HttpResponseForbidden('allowed only via POST')

Example 2: Django forms I cannot save picture file

class ExampleModel(models.Model):
    model_pic = models.ImageField(upload_to = 'pic_folder/', default = 'pic_folder/None/no-img.jpg')