Well searching the web i came across a very well detailed website on light source, its pretty cool and shows how the light source would change in diffrent conditions... give it a quick look, it may help.
http://www.itchy-animation.co.uk/light.htm
ID:258010
 Mar 29 2008, 4:13 am
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BTW, one of the guys from that studio is apparently known as Arne on the Pixelation forums and has a great site with a lot of info about digital painting (and I think some pixel art in there, too).
I'd encourage anybody and everybody who likes illustration, concept art, etc. to also check out itchstudio's link page. From there, you can find links to Craig Mullins (you might remember me mentioning him from the blog front page), Feng Zhu (who has some great concept art tutorials, and Adi Granov (as well as more).
That being said, another great tut for shading and light sources is by Ron Lemen.