Add `help_text` to Django Admin field

Question

I'm attempting to display an image when editing a user on the admin panel, but I can't figure out how to add help text.

I'm using this Django Admin Show Image from Imagefield code, which works fine.

However the short_description attribute only names the image, and help_text doesn't seem to add an text below it.

How can I add help_text to this field like normal model fields?

EDIT:

I would like to have help_text on the image like the password field does in this screenshot:

Answer 1

Use a custom form if you don't want change a model:

from django import forms

class MyForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(MyForm, self).__init__(*args, **kwargs)
        self.fields['image'].help_text = 'My help text'

    class Meta:
        model = MyModel
        exclude = ()

@admin.register(MyModel)
class MyModelAdmin(admin.ModelAdmin):
    form = MyForm
    # ...