Try a tall and narrow bookcase or etagere placed in front of the outlet to balance out the height of the window. The bookcase will cut the wall into smaller segments so it makes it easier to decorate it. Then you could place art on the wall between the bookcase and window and art on the other side of the bookcase. I would keep the vertical orientation going under the peak of the wall by hanging one vertical piece or two related pictures one above the other between the window and bookcase. You can probably do a large piece or a grouping on the other section. Should be easier to deal with when it's less continuous space. I'd also use full panel drapes hung a little above the top frame to accentuate the height. Are you saying the long part of your sectional would go in front of the window? I would avoid blocking the window.

I think you have a real handle on what you want but a decision this big needs people you don't know and never will's opinion. Support and agreement is good and these folks know there stuff but it's your place you will live there. You never mentioned budget but for the kitchen I don't believe your prices include labor, electrical and plumbing, do they? I do know some people that paid more for the kitchen remodel around here that you can buy a simple tired home for. 12X14 sunroom. I was in the sunroom business and didn't want one for my home, sweltering in summer and stone cold in winter. Yes you can heat and cool them and watch those utility bills skyrocket. They look to be initially inexpensive but once you factor in added utilities it is more cost effective to extend with traditional construction with a large focal window. They will tell you they will appreciate the value of your property greater than traditional construction but now that they have been in fashion for a while they can actually be a deal killer. We are looking at homes and don't want anything to do with a sunroom. Glass is glass, the greatest heat loss is through the glass in a home, until they invent a high insulating glass that is affordable that is simply a fact. R-3 per pane, maybe, you do the math. Full thermal break or not. No one would build a room and put in R-6 of insulation in a wall. Sorry I know you are focused on the kitchen but thought I might give you my spin on sunrooms.

Have you thought about wall paper on that wall you definately need a better light and IMO no Edison bulbs any hwere if you really care about colors you choose.You have some nice choices but then you cast a yellow light over it all. Change your bulbs to LEDs in 4000K before doing anything moore you will be surprised how much better everything looks at night.

Not a “registered” designer word, but it works for me…I call what you have “wrap" walls. There is no trim separating one area from another. I would keep all the walls one color. You could paint all the trim/doors differently than the walls. Gray would work. It would give a lot of interest to the rooms.