|faint white lines on black paper|
When working with toned or colored paper I take an approach just as I would for on oil painting. I do an underdrawing.
Because I am working on black, I am doing it in white first. This does two things, it establishes a light, bright base for the following layer of colors, and helps me fine tune the actual drawing. The white base allows for the subsequent colors to be clear, bright and true.
|White value drawing|
First I use a rather blunted white pencil, simply to establish this base of white, then I will follow it up with a sharp white pencil to emphasis and correct the drawing. At this point I need to correct any flaws in the basic drawing, make sure I have a full range of values and that the drawing itself hold together.
This is a good time to walk away.
Make sure the drawing works, both technically and as a work of art.
Now, we are ready for a little color.