To start, I'm using Oil paint.
Im still in the stages of planning out my image before I place it on to the canvas. So far I know that in a section of the Background there will be some monochromatic figures/head shots. Before I dive in I questioned, What if the grey scale figures are to dark, and how do I go about shifting that? I have some vague ideas on how some kind of wash would help with this. Yet something tells me that its a little more complicated than just adding washes of Black or White. I'd just like to be more certain before I move ahead.
How can I "shift the Values up or down" with oil paints?
An answer with examples using Color, or Monochromatic would be greatly appreciated if it makes a distinct difference.