Changes in light will change your picutres. Outdoors, if clouds darken the sky, or you change position so that your subject is lit from behind, or if you move from a bright area to the shade, your pictures will change as a result. Light changes indoors, too. Your subject may move closer to a sunny window, or you may turn on overhead lights or decide to use flash lighting.

Light can affect the feeling of a photograph so that a subject appears, for example, brilliant and crisp, hazy and soft, harsh or smooth. If you make a point of observing the light on your subject, you will soon learn to predict how that light will affect your photographs, and you will find it easier to use existing light or to arrange the lighting yourself.
CC: License - http://farm4.static.flickr.com/3446/3405170093_de47a2e2cb_o.jpg
CC: License - http://farm4.static.flickr.com/3446/3405170093_de47a2e2cb_o.jpg

shadow art...
shadow art...

cool shadow
cool shadow

And now for a fun little homemade video to illustrate the effects of light direction on the subject:


read text book chapter 13 on lighting for more information.
Your subject can be anything. Try to use natural light when you can.
email me at rhoadesj@psmnow.com with any questions.
Good luck and have fun!