Final stage, we will create shadows and highlights.

Create a shape with shape tool.

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2008 Logo design

Warp the shape (transformation).

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2008 Logo design

Use only 1 style and note the gradient blending mode - Hard Light.

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2008 Logo design

The highlight has the same shape structure, only a little bit smaller size and Color.

Next select the circle (the 1st shape), create a new layer and overly the are with Black to transparency layer ( opacity about 70%).

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2008 Logo design



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2008 Logo design



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2008 Logo design

Change
  
the ball color (the color of the 1st shape)

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2008 Logo design

Fix all the mistakes done when painting (if you have no, then it's ok).

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2008 Logo design

Merge the layers and there we have it.

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2008 Logo design



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2008 Logo design

Hope you learn some techniques and understand the vector (shaped based) style.



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2008 Logo design

ENJOY!