I'd start with a base color and then add two accent colors -- maybe in your living room furniture, rugs, accessories, etc.. Then you can paint most of your space with that base color and change it up in the kitchen or the dining room with your accent colors. Bring in decor in the kitchen with art or ceramics in those colors as well. Hope that helps! Great kitchen!

[https://www.houzz.com/photos/mill-valley-estate-traditional-bedroom-san-francisco-phvw-vp~2140287[(https://www.houzz.com/photos/mill-valley-estate-traditional-bedroom-san-francisco-phvw-vp~2140287)

Take a look at this picture and it will show you a soft grey tone for your walls. You can type in colors that work with grey and you will get lots of choices to look at. Most have lighter colored floors so make sure you look for floors that have your tones.

I would go with a warmer sand color. Grays can go cold and it can be hard to live with if you don't have much sun. Something like in this picture.

Looks good! I was going to suggest some sort of neutral that went more towards the taupe in the tile to bring in the warmer colors of some of your furnishings. Then add colors with your artwork and accessories. Those can be changed out easily with the seasons or as your tastes change.