Photoshop Mouse Painting Tutorial: Performance of glass sphere light sense

This tutorial focuses on how the optical effect of the glass sphere, is the theoretical level of the problem. Specific drawing needs to be based on the theory here slowly to depict light sense. may be more difficult to draw, you can refer to the process map.
Final effect

1, the new size of the appropriate document, background filled with dark gray, a new layer, with the elliptical marquee tool pull a positive circle selection, you can draw some of the radial gradient or brush some of the high light and darkened, as the base element.

2, the general glass ball from the plane to see, around due to the lack of light, will be darker. Add a circle of dark around.

3, according to set a good light source, draw some high light, due to glass transparency and high reflective characteristics, the general sphere in the same direction both sides have high light.

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