Opinions Expertises Evaluation House Plan

In my opinion, you are at a dead end. You try to fit individual aspects like a central straight staircase and an atrium into a house, thereby initially taking away at least a third of the upper floor area as usable space and then see how you can conjure up rooms.
It's fun to play with, but it's not a promising approach for a good design.
Unfortunately, the upper floor is drawn poorly from my perspective. Besides the convoluted niches, the routing of water and wastewater pipes is questionable, I also don't understand the dimensions of the furnishings - 2 huge sinks for the children, surprisingly shallow closets in the dressing room, and the measurements of the bed and shower suggest small people.
Only those who detach themselves from the problem will solve the problem.

This IS a Sims house - absolutely. Building it like this for real, I would find unacceptable. My criticism was directed at the fact that I still consider it legitimate (and therefore not to be dismissed) to represent one’s building dream in such a pictorial formulation.

In reality, of course, one would build it more down-to-earth than in the imagination, and for further discussion I would also find it sensible if the OP switched to the appropriate mode - trivialities like functional dimensions included.

... just read and don’t post disconnected graphics here one after another for discussion.