A white ceiling would have been too stark. However, I'm a little nervous about what effect it will have on the room if the walls are painted, too. Thanks for your help. What colour to paint a ceiling depends on the height of your ceilings. Generally, if it's low I would keep it white, as a dark colour will give you the feeling you're in a box.
Higher ceilings look great in a richer palette of colours.
Or choose a paler version of your wall colour by adding a little white paint to it. Unless your ceilings are architecturally interesting, it's best not to draw attention to them. Remember that any work on a ceiling, such as a painted sky or faux tiles or an architectural design, is always harder to do than on walls because of the strain on your neck and back. So, consider carefully before you begin. It is dark brown right now.