Beautiful space. You can use any color you love.

I recommend using a neutral color on the main piece of furniture, as this is normally the best investment piece and you don't want to get tired of it. I would question the size of sectional for the space. Sectionals can be great for small spaces, but make sure the traffic flow still works.
Pistachio/seafoam is very popular right now and is a great tranquil color. You need to had splashes of color in an accent chair, art, lots of pillows on the couch, area rug and a few vases/canisters in the kitchen. Orange is a great complementary color to the seafoams to accent with as well.

Thank you! What are your thoughts on navy?

Love navy but for a sofa/sectional will show every piece of lint/dust. I think the lighter green of the 1st sectional I posted is very neutral

Navy is a great color. We are seeing it a lot also. Navy offers a lot of depth to a room, but you need to make sure you have good lighting.