As far as I understand it, you do not have inside corners downstairs, only upstairs. Downstairs you have a complete rectangle. So the stairs will land relative to the wall the same in your version as my version (maybe something like the red line. Where they do not land the same is relative to the door. However, there is nothing to say at this point that the door to the upstairs isn't on the ocean side of the house instead of on the driveway. You could have two, or have a door only on the yard side, not the driveway side. But it might make sense to have the entrances to each completely separate anyway. The green door is the one that's there, but I don't know if there is anything stopping you from having a door in the blue position.

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If you focused on some greens and lots of whites in your furnishings and even some certain green on white, trellis prints in drapes or roman shades, over time, that will make your home look like a lovely garden. Than you can accent with the colors of your favorite flowers. You have a lovely home, you just have fun making it yours!! No one goes into the Forest and talks about removing all the trees and planting only bright annuals, that bloom for a few weeks. They marvel at the height and breadth of the trees! and may add some bulbs here and there where the sun allows. Bring is some brighter white lights in areas as you can and just love the fun you have doing soo. Such a work of many craftsmen is your home! It's done by humans, so flaws may show up. Some might bug you and other may not. As long as your warm in the winter and cool in the summer you have shelter, and thus time to go through phases of your home redecorating.

Must to say your kitchen look modern and beautiful, I like it. I also love the red color. What I did is to put on the marble some cool kitchen gadgets in colors you like, it will make your kitchen much colourful. I bought few weeks ago a mandoline slicer like this https://my-kitchengadgets.com/collections/best-sellers/products/round-mandoline-slicer-vegetable-cutter just in red and it gave my kitchen unique pattern.