How do I show enthusiasm and pleasure without judgement?

Yes of course there should be judgment. To do otherwise is ridiculous. Kids need direction. They need to find their place in the world. For that, they look to the parents for a whole host of answers on questions that are necessarily subjective. That gives them an identity. That gives them something to represent that makes them different from everyone else. If you don't give them that as a parent then you might as well just give them up for adoption to someone else who uses the same technique because it simply won't make any difference.