I found solution for this, create new fields for employee, relate to user_id.image

user_image = fields.Binary("Photo", related='user_id.image')

user_image_medium = fields.Binary("Photo", related='user_id.image_medium')

user_image_small = fields.Binary("Photo", related='user_id.image_small')

Hello Vu Huynh,

Here, method _onchange_user() in hr.employee will call user will change so selected user's detail will set in hr record

If in user any detail update then it will not _onchange_user() method of hr.employee.

If you want to do that, you can add following method in hr.employee model :

class hr_employee(models.Model)
    _inherit="hr.employee"
    @api.multi
    @api.depends('user_id.image')
    def change_employee_image(self):
	for record in self:
		record.image = record.user_id.image
    image=fields.Binary("Image",compute="change_employee_image",store=True)