I think Maxima may have purposely chosen to hold back a bit in order to let her daughter shine. The Queen looks beautiful and the jewels are amazing (very happy to see her in this tiara) but at the same time it's the Princess of Orange who catches your eye. Maxima has done this before, she is very well aware of when to shine herself and when to leave the first place to someone else. She did so with her mother-in-law when she was Queen, with her husband at certain events and it feels like she's doing it again. Proud mama looking good herself but enjoying her daughter stealing the limelight.