Good airmanship is about using one's brain. There are times when it would make sense to talk to an airfield, perhaps when a tract of airspace is notammed but not restricted, but there are others when it would be totally counterproductive. For example, crossing a busy training airfield at 4K agl and adding to a very bust frequency with your details which essentially tell everyone that you are no threat is, I would argue, poor airmanship. There are no hard rules for what constitutes good airmanship. It's about awareness and thinking about how you can contribute to safety - sometimes that means keeping quiet.