Willem,
It looks (and sounds) like you have a lot of control over that thumb pick, which is more than I can say about my own attempts to use it. Good job. And I agree with Ness that I'd like to see you alternate bass strings a bit more. It would add some variety to the song.
Thanks Dennis,,after Nessa suggestion I gave it a go and its a good practice for improvement with the thumb pick,,it sounded nice too..
Willem