what are the principle of art/design & colour basic?

Answer 1

This is a very general question you're asking.
There are so many "rules" and principals
and art and design being:
a) two different fields; and
b) very wide subjects...
you have to be more specific on this on.

however, you can try any of these:
en.wikipedia.org/wiki/Design_principles_and_elements
www.johnlovett.com/test.htm
char.txa.cornell.edu/language/principl/principl.htm
www.goshen.edu/art/ed/Compose.htm
www.princetonol.com/groups/iad/files/elements2.html

Answer 2

just chill out & define the color as per the yours choice. art is alwys make as the way you like it.