user_extra_sello_imagen/user_extra_sello.py

# -*- coding: utf-8 -*-
from openerp import models
from openerp.osv import fields


class ResUsers(models.Model):

    _name = 'res.users'
    _inherit = 'res.users'
    _description = 'Add extra data imagen firma to Users'

    image = fields.Binary('Sello')
    #image_filename = fields.Char("Image Filename")