The easily missed detail in the photos of Queen Mary's children

The latest birthday portrait of Queen 's eldest daughter Princess Isabella has been released - and it features a detail many often fail to pick up on.

While most royal snaps are taken by professionals, the doting mum-of-four is almost always the photographer behind her children's candid birthday portraits.

And she usually includes one or more of the family pets in her snaps for a personal touch.

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