Goro: I got it eventually.
To the other concerned with color:
I am not a master myself. (unlike Goro…humble as he may be.) But I try to do a quick painting once a day I dont spend more than 30-45 minutes on it, and it always ends up very sloppy, But I always focus on accomplishing something, Usually my primary focus is creating a mood through the use of color. So I will just start throwing some colors down with a general idea of what I want to create and just go with it. eventually you start to kinda see how light works with color, how color can determine the amount of detail nessicary, etc.
try this: Grab a photo from the internet of something that is cool (a building, lanscape, a cat, whatever.) Bring that photo into photoshop and start painting over it in a seperate layer. Try using only monochromatic colors and see what you come up with. Limiting your color pallete is a good way to force yourself to be more creative with your choices and it is also a very good way to observe the influence light has in the photo.
Again, I am no master, but thats how I do it and it certinly helps me alot.