Camilla, on the other hand, only joined the Royal Family around 15 years ago.
More time in the public eye may have helped Princess Anne become more confident and her body language could show this when compared with Camilla.
The expert commented on an outing where the royal women greeted each other at the races, before the coronavirus pandemic.
“I really love the picture with Camilla in the green hat,” he commented.
“How Princess Anne is holding Camilla’s hands is a power gesture.”