Looks very jagged.  To me, it looks more like a rock than a sphere.  I know you've heard it alot, but perhaps some AA?  And possible more contrast.  But yeah the spherical shape should be restored before anything else ;)

I think Cure is referring in inner AA, but I think that first the lineart would benefit the most from becoming more sphere like. I'm genuinely curious how it ended up with its current shape; did you try to resize it using the drag function in MSPaint? That's the only thing I could think of that would cause it to be misshapen, plus take the bottom line away from your text.

If that was the case, the only advice I have it that you should be aware and plan ahead to make sure your work has the proper dimensions. Pixel work can't be resized easily and still retain its quality.

Well, I had AA, but then Wolverine complained about it was no use when they had dark themes so I had to remove it.

The jaggy shading really doesn't scream "sphere" to me, and that thick outline would work much better if it weren't so clunky/jaggy, and had some AA.

I agree with Wolverine. I, too, use a dark theme and this does not look good.

It's good but ya should remove the outer anti-aliasing as it just doesn't work for those of us who are using dark themes on Pixel Joint.