I've made this sphere/orb/ball, and want to ask you all for comments, and suggestions for improvement.

I made it at around 600% zoom. And already I notice that the highlight's gradient is too....not smooth enough, at its finished size. When zoomed, it looks smoother. So I'm pretty sure I'll need to fix that. Other than that, it just seems to be missing something, although I'm not quite sure what.
What other issues or features do I need to address, in your opinions. As I'm planning to use it, it will be suspended in space, so to speak. It will not be sitting on any kind of surface or anything. And I realize it will need some more highlights to represent reflections from other objects nearby. But I haven't actually created those objects, so I'lll have to add those reflections later.
Oh, I should say that I want it to have a flat, smooth. opaque surface -- maybe something like a smooth leather. But I'm also thinking about sort of a hard plastic kind of surface -- like what a typical keyboard is made of, or computer case. I haven't decided for sure yet. Ooh, or maybe waxy, like the surfact of a candle!
Oh hey,I know! It needs some indication of ambient light. I might not be using the word 'ambient' right here. But the major highlight represents more or less the light source. And I'm thinking somehow it needs some indication of the light that fills the space the sphere/orb/ball is in. What do you all think?
And certainly I'll appreciate any and all comments and suggestions.
Thank you very much
