Have my little and confused analysis/list of what I am trying to tell through these portraits regarding these little Jedi:
Jocasta and Sifo Dyas share some elements, her earrings and his braids parallel the other, and they wear their hair in bun/s, and the palette too.
Her lighter colors reflect her stronger connection and trust in the Jedi.
Sifo's colors are still those of the Jedi, but under the lighter brown robe there is a far darker one.
Dooku's colors are dark and share no connection to those of his friends.
Jocasta has a full smile and her hands are both shown, she will not harbor secrets or ill intentions in the future.
Sifo shows only one of his hands, he will keep a terrible secret, but not out of hate.
Dooku's hands are fully hidden, and his smile is more closed off, and in the future we know what he will become.