For the sake of having his picture painted, he poses with an air of conscious dignity beyond his years.

He sweeps his cloak around him like any grown-up cavalier, and holds out a plumed hat and walking stick in a lordly fashion.

The child is consciously acting the part of a grown-up person, which only emphasizes his childhood.
But the air of refinement and distinction in the picture comes straight from Van Dyck.

As you look at the portraits of the Duke of Gloucester and William II.

of Orange side by side, it may puzzle you to say which is the more attractive.