oooh, soo cute! And by the way, great idea with the towel and talking to them....I've had ducklings do that before, and I have put a towel over their cage so they couldn't see me, but then I would just try to be quiet rather than make them think I'm still there.....I'll definitely try doing what you did next time.
The last picture is my favorite too, I love the sideways look they give, almost as if they are studying you or whatever they happen to be looking at at the time.