How to draw a Aqua ball in SkinMan
At first, draw a black circle, the base
Copy and paste, change color to cyan
Make diffuse of cyan circle like this.
Draw a white circle that will be the hilight part. both Fill1 / Fill2 colors are white and Fill2 alpha is zero for gradation.
Make gradation verticaly
Make very little diffuse of hilight circle for fit to background. Complete