HIDDEN MEANING behind birthday portrait of the Queen, 96, posing with two white horses
https://meaww.com/hidden-birthday-portrait-queen-horses
Depending on the culture, white horses symbolize purity, heroism or death.
https://www.reference.com/world-view/white-horse-symbolize-712c03a575a30559
If you want to ride, don't ride the white horse.