1.) Attachment cannot be loaded.
3.) Think carefully about whether you would really use it.
A dining table is right next to it and usually more comfortable.
My experience with this: Over 10 years ago, I had a high counter: I hated sitting at it, but back then it was the only option.
Now we also have (only) a half-height (!) counter in our house: We never sit at it... We could have indeed used that space more sensibly. You can also build half-height cabinets (instead of counters) that serve as a boundary. The doors could even face the living room if you like. Just a suggestion.
6.) I can very well imagine two symmetrical bay windows on the south side.
Since it’s the south side, good external shading is very important.
7.) ...can be very well realized with 2 dormers. *g*
*** Size living/dining/cooking:
I find 48 sqm sufficient. Enlarging bay windows: In which direction do you imagine it?
Along the house side or further out from the house? How far does the dormer currently extend from the outside of the house?
*** Study as bedroom:
Master bedroom or children’s room? I assume the former.
The room is 13.3 sqm, dimensions: 4.43m x 3m
The depth behind the door is, if I understand correctly (dimensions missing), not enough for a wardrobe, since these are usually at least 60cm deep. So the wardrobe would have to start after the door. For this, the window (facing the other house) would have to be moved toward the corner of the house.
The double bed would then be turned 90° compared to the current bed: foot end facing the wardrobe.
A wardrobe 60cm deep and a bed with at least 2 meters external dimensions result in a maximum passage width of 40cm in a 3m long room: The wardrobe would have to have sliding doors and you’d always have to stay very slim.
So, in my eyes, poorly practicable with the current layout.
*** How wide is the garage passage?
*** Do you need such a "large" utility room if you have a basement?
Idea: Slightly reduce the utility room to be able to move the stairs toward the garage.
Result: The children’s rooms upstairs become the same size and the study becomes a bit larger (even if it doesn’t solve the “slim in old age” problem).