
So anyway... my tip is (as I have said before) that it's a great idea to keep a journal of the colours you like on an image... This goes one step further and shows the different levels of colouring the same image..
My Beginner approach is using only one colour/ marker for each colour on the image... some level of shading created from layering the one colour on top of itself.
My Intermediate approach is using a number of (2-3) colours within a colour family (eg. E31, E33, E35) to create more depth in the shading.
Mu advanced approach is using markers from a 'higher' colour family in order to create more contrast in the shading which creates much more depth and thus more interest and the image has more dimension.