Ok, that is a very blanket question, are you purely asking for decor advice or are we taking on a major budget and real $$ changes? 1. what is with the white crown trip around the exhaust pipe for the vent hood? 2. a counter depth fridge would help 3. the backsplash is dated the counters are fresh Dining 1. put the table in the center of the room and remove the table cloth 2. center the globe art piece to the wall and lower, in fact, all your pictures need to be much much lower, and the smaller ones need to be grouped together more collage style. master bath 1. replace the counter and faucet 2. paint the cabinets and add hardware 3. frame the mirror 4. tile the floor ( carpet and water dont mix) living room 1. lower the artwork 2. declutter the top of the tv console a bit 3. a round coffee table would help you a lot, possibly even two nesting tables that are small and could be pulled out to use. master bed 1. add some curtains to the windows to soften 2. add some storage like an ottoman at the end of the bed to put the 'junk" in. 3. lower and group photos and art. So far you on track, I like your living room and your art pieces. The new shower doors are pretty!

I really want to make the space more airy and elegant. I just don't know if I should design the 2 built-in bookcases to the ceiling and then join the 2 with floating shelves as shown with the blue tape, or just build 2 independent bookshelves. If I design 2 independent bookshelves, do I stop stop at the height of the French doors, or do I stop where the ceiling starts slanting?

With the wood ceilings putting a color on the walls will just darken the space. I think keep it white. My go-to white is Ben Moore's "Chantilly Lace": it's bright without being too blue or too yellow. Are you going to rent this out as an AirB&B or just keep it as a guest house/space? If so, you don't need a large fridge. You could just get counter height fridge and freezer and put where the fridge is now, or on that far wall where you now have the 2 stools and build up more work space where the fridge is. https://www.amazon.com/under-counter-freezer-Home-Kitchen/s?k=under+counter+freezer&rh=n%3A1055398 If ya want to paint the doors a color that's find. Maybe navy instead of black. Or even red - kinda goes with a farmhouse....

My Idea is to have reeded glass inside window frame on inside of house so it looks like it is the window. The small quarter round framing is to hold it in place & finish the edges of glass. You want it to look like the decorative glass is the window. Make sure to clean the inside of the existing window very well before adding glass! Take your window measurements to a glass company to price out. Not really expensive I think. If builder is willing to pay for window covering, which wouldn’t look great IMO, & wouldn’t hide view, maybe builder will also spring for cost of this & actually do the install for you. Doesn’t hurt to ask!