My family from is a little over 600 sq. and my ceiling is approx. 24 ft.. I'm try to make the room feel cozy with over doing it wih furniture. The walls are a cream color now. If I, paint all four walls brown and the ceiling white. Would this help? My firniture is brown leather with dark cherry wood. I need help

Darker colors will make your room appear smaller. Using warm colors will of course make it cozier. If you do not want your ceiling to appear as high as it is, use a color other than white.