They are portrait photos released for a milestone birthday. Nothing more, nothing less.
All royals do it.
Kate is obviously happy with them, as is the Palace.
They are an excellent PR exercise, as everyone is talking about then.
In a few days, the furore will die down, and the world will continue spinning on its axis. Just like every other time portraits have been released for our consumption.
The critiques and suggested alternatives that Kate should have considered (by random MNers, no less) are just a bit
/ 