May I be so bold as to say that the "grinning granny" image suits Her Majesty, described by Bailey as a "very strong woman" with "very kind eyes with a mischievous glint". During the day the King's Troop Royal Horse Artillery fired a 41 gun royal salute (Green Park*) and later a 62 gun salute from the Honourable Artillery Company at the Tower of London**. Eighty eight facts about Elizabeth II from Royal Central HERE, e.g. The Queen is the only British Monarch to have visited China and proved she is and was always ahead of the game by sending her first email in 1976!
In case you wondered:
* The standard Royal salute is 21-guns; another 20 guns is added when the salute is from a Royal Park or Palace.
** The 62 gun salute is the aforementioned 41 guns (the Tower is a Royal Palace) plus 21 for it being from the City of London.