Hi Patrick Galletti,

@api.model
    def _default_image(self):
        image_path = get_module_resource('module_name', 'path-to-image/image.png', 'name_img.jpg')
        return tools.image_resize_image_big(base64.b64encode(open(image_path, 'rb').read()))

define the field in res.partner.

image = fields.Binary("Image", attachment=True, default=_default_image, help="This field holds the image used as image for the product, limited to 1024x1024px.")

 From your question, I just understand that you need a field with an image and that image from a particular path. This may help you. If you have any another question free to contact us.

Thanks

Nikhilkrishnan