Dreams of Another Day (10" x 15") Colored Pencil on Black LetraMax (Framed 17" x 22")
Working this way taught me tons about values! So much so that I always start with a white value study when working on black. Not only does it help to brighten the highlights but all the hard work is done with the value study, adding color at this point is nothing but FUN, FUN, FUN!
The only way to achieve the values is by pressure of the white pencil.
If you want to try the reverse, black pencil on white paper, see the work of Ann James Massey,