I think Kate really suits green but that dress is horrible, imo. The sleeves and hem flounces look dated and fussy and the fabric isn't good, given the sheen.
Perhaps it's progress, but I want my royal family to look regal, slightly aloof, different from commoners
In this portrait William is too casual. I don't like the hand in the pocket, or his stance, and Kate looks as though she's saying over her shoulder, "Okay, I'll be there in a minute" to one of her children.
She'd look more like a Queen-in-waiting with her hair up too. I know we have moved on but this looks like they may be about to go out dancing. The car keys are in his pocket.
Not the best portrait, sadly. I agree with others. It lacks depth. It's too like a photograph.