Nice pictures and good advice. One thought, I like to carry the blade up in that position. I do so for a couple of reasons, one is the common way people try to block it. When carried with blade up you have to worry about the blade being pushed back against the thumb, and being guard less, now your thumb is at risk.
I am not trying to say what is right or wrong, just purhaps a different view point.
PS Those pictures look like they could have come from a training manual. I hope people follow that advice.