func downloadFaceId() {
    if let image = personimage, let imageData = UIImageJPEGRepresentation(image, 0.8) {
        FaceService.instance.client.detect(with: imageData, returnFaceId: true, returnFaceLandmarks: false, returnFaceAttributes: nil, completionBlock: { (face:[MPOFace]!, err:NSError!) in


            if err == nil {
                var faceId: String?
                for face in faces {
                    faceId = face.faceId
                    break
                }

                self.faceId = faceId
            }

         })