I am going to differ, here.
I think the lights are too big, too close, and ratio is too much 1:1. You've transitioned from softness over into flatness. The catchlights in the eyes are much too big. Look at her eyes in #3, they look almost like she's got silver contacts in. The flatness and the grey background seem to me to give this a sort of somber feeling.
That said, there's a lot of excellence going on here as well.
Basically these are still very cute photographs with a lot to like. The poses are sweet, the accessories are excellent. You've framed them well (surely a royal hassle given an even slightly mobile kid, and all that stuff to toss around -- and out of frame!). Focus etc look nice.