I have to go back to my objection that square meters alone don't mean anything, but rather the furnishability counts.
In your last floor plan you can clearly see what I mean: One bed is under the dormer directly beneath the window (if it is supposed to be floor-to-ceiling glass—I would find that even worse). I wouldn't want to sleep there if it feels like there's nothing above my head, with the door right at the foot end and anyone who comes in immediately falling into my most important retreat—the bed. (I am actually talking about feelings, coziness, etc., here.)
Because of the windows in the children's rooms right next to the partition wall, you can't place longer cupboards, they would otherwise stick out in front of the window / the same window can't be opened anymore.
I would skip the door between the dressing room and the bathroom. It takes up space in both rooms and it's always a question whether you want to lock both doors / think about unlocking them. Unless you invest in some technical solutions that allow simultaneous locking or you never lock them anyway (and can teach that to your children).
Edit, just read it now: regardless of whether it is considered in the approval or not, if a basement room is ever supposed to become a bedroom, the escape routes have to be right. No matter how unlikely it is, but if someone dies down there, no one will be happy anymore.