Sample:AquaBall

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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