def METHOD_NAME(self, custom_placeholder, data, view_kwargs):
    """
    after create method for custom placeholder to save image sizes
    :param custom_placeholder:
    :param data:
    :param view_kwargs:
    :return:
    """
    if data.get('original_image_url'):
        uploaded_images = create_save_image_sizes(
            data['original_image_url'], 'custom-placeholders', custom_placeholder.id
        )
        self.session.query(CustomPlaceholder).filter_by(
            id=custom_placeholder.id
        ).update(uploaded_images)