What, and where are you painting?

Thank you! It's a bedroom with many different height walls and weird angles. It get some light - but not a ton. The walls have a few defects. I'm painting it Navy. Thank you!

With many different hieght walls and odd angles, navy could be an interesting way to obscure some of that, and draw attention to the bold color. But since it will be darkening I think I would look for a way to hang many interesting mirrors to reflect the light you do get.

I suggest a matte sheen for an adults room, eggshell for a childs.

Other than in the bath, I don't like any sheen to my walls at all. I go completely flat paint.

A matte impervo will clean easily and has low sheen. It's about as close to flat as you can get while still being practical .