To choose the color of eye shadow we should see the eyeball. The color of eyeball is the bases to choose the color of eye shadow.
If the color of eyeball is blue or similar to it than brown or grey color eye shadow will look good. If the color of eye ball is exact blue than dark brown, purple or dark green color shadow will look good.

If the eye ball is of brown color than dark green or charcol (ash of wood) color eye shadow will increase the beauty of eyes.
If light green color eye ball is there than green, grey, bronze & golden color eye shadow will look good.
If your complexion is very fair than blue, pink & charcol color shadow will look good.
On fair skin red, brown & yellowish color shadow will look good.
On brown skin light brown, dark brown & golden color shadow will look good.