An odd subject. It looks a little flat, I mean not obviously sphere like. A wider shot would have made it more obvious and also shown the light patterns on the ceiling. The light part is a little too light in my view. I prefer this in B&W, I think presence of the green is giving rise to my earlier comments and without the colour the shape and light comes through much better.
Interesting subject for a photo. This looks like a looking up into the bottom of a hanging lamp rather than a top down shot. One of those bee hive looking hanging lamps perhaps.