LittLeAnqeLAyumi- I wear clear contacts for my vision, but they are not colored. That's my natural eye color. But natural light always makes eyes stand out more, too. The picture below uses artificial light instead of natural, and you can see it doesn't have that same effect on the eyes.
And NanteNa, you can see my skin looks less flawless in that one, too! XD So lighting really does make a huge difference.
Jo_Kittie, was that a purr? ^_^;