Why not contact your local Planning Office or look on the website? There’s lots of info on there.

It’s difficult to tell. It seems like much of the plot is to the right of the house but no principal rooms face that way. Personally I don’t like parking right in front of your principal entrance- better to have something decorative there such as garden or a water feature. It seems like if you were going to create a central courtyard in the house it should be opposite the front door in order to have an interesting sight line. The downstairs bedroom seems like it’s either lacking privacy for a dependent relative or it’s too big for staff. It’s not clear where you live so it may be too hot for outside living spaces- but in many countries it would be nice to have an outside living space (so a covered patio for instance) It’s not clear how you access the pool area. It seems like you might go through a living room to get to it. I wonder if you should plan storage near the front door for push chairs or visitors shoes. It’s not clear where you would do laundry- perhaps there is somewhere on another floor. Considering the size of other rooms the office seems modest. I would be interested to see more of the plan

I would say the white scotia either side of the door frame finishes too short and but not running up to door frame it draws your attention to it which is not what you want. I think it should go up to the door frame at least

Looking at the overall pic I think your room would really benefit from a large soft rug and a coffee or side table or two as well as the cushions that you queried. Loaf has lovely linen and velvet ones and the colour co-ordination is almost done for you as they only do sludgy colours. I would avoid pattern. Consider some small long rectangle ones for back support when sitting on the sofa. A mix of shapes is good.