Looks good, maybe a medium gray/blue as more contrast would look good, pull from backsplash.

Get two large foam core boards or poster boards and paint them so that you have a decent size sample that you can place in different areas around the kitchen. Look at each in the morning, afternoon and evening to see how they work with the light.

For me, I would probably paint the walls deep burgundy.

I agree with Jennifer Hogan. That kitchen is kind of a blank slate. It needs some punch, and burgundy would sure do it! My cousin and her husband once owned a house that was very neutral all the way through. They painted their kitchen a green that was so dark that it almost looked black. It did have light-colored granite countertops and carrara marble backsplashes, and it had a lot of light from the adjoining Den, which was almost all windows LOL. It was a knockout!