Would paint a pale blue gray. It would go nicely with your cabinets. Add fabric to to windows and some trim around windows. Nice space

I understand what you want to do, so here's my suggestion, if it fits.....I'd move the couch under the mirror. Move table to the center of the kitchen, like an island. Sounds like it's two adults and two toddlers, so I'd definitely remove two of those chairs. Are your kids in high-chairs, if so move the other two chairs out too. Basically you want four chairs not six. Move them to a garage, basement or another room. Put the chairs around two or three sides of the table. I'd leave the side near the stove and washing machine(?) open. TV would mount to the right of the back door. See if that would work. Either way, it's going to be a tight space. Post pics please.

I think I would have one set off steps down and move the dividing presses to the side where your sink is, making it a peninsula. That would make for a nice L shaped banquette seating area where your blank wall is, and the gallery backdrop would be great there. You could also have a nice long table as opposed to the small square one. I also hope you don't mind me saying that I think you need to reconsider the placement of your hob. It's right beside a door which will be awkward and you have your back to the room when entertaining. You will have such a nice kitchen that you should make the most of it for entertaining. Even you consider putting it on the island facing the dining area?

As you've got the Abbey Road sign, why not make it a music corner? Perhaps a Beatles inspired / Sixties monochrome scheme. You could get a musical notes design printed on an outdoor canvas for the wall, or a sail & hang over to create shade. Perhaps some instrument outlines on the wall. Planting could be black & white with pops of colour. A decorative white chair & outdoor rug would look inviting. Or you could even paint boards b&w stripes like the zebra crossing!