What bothers me about the bathroom is that there is only one sink and the area with the toilet, shower, and sink looks so dark and cramped.
How about a large walk-in shower and a glass splash guard?
Double sink on another wall?
Maybe haydee can explain that better, because I already see a walk-in shower in the original plan. Maybe her comment only referred to the size...?
In any case, for me, everything is walk-in that is flush with the floor and without an additional door—whether glass or masonry.
Still, I find the arrangement in the bathroom unfavorable; the shower and toilet could actually be more spacious.
Upstairs, I would generally shuffle everything around again. A bedroom facing southwest, which is probably more attractive for children (you only sleep in the bedroom). I find the position of the bed terrible and that the way from the bathroom to the dressing room is 1. as far as possible and 2. always past someone who is sleeping. It already looks uncomfortable and uninviting to lie in the bed on the plan, which is surrounded on three sides by traffic areas.
Also think about your routines here. For us, it goes from the bed to the bathroom first and then to the dressing room (which is not accessible from the bedroom!). If we didn’t ventilate the bedroom “with the window open” in the morning, I wouldn’t enter it again until I go to sleep.