Silhouette painting is mostly blocking out values with different shades so the base can be done with 100% solid black. What I meant by 25%/25% is this


Only until you guys get used to it. You can mess around with both but it's never good to paint in 100% opacity because the paint will never overlay (blend with others). Like Fork suggested, if you guys can get a hold of Kodeybell or Gallagher then you are set. Those two are amazing with digital paintings. Cold and I are more landscape/concept artists than illustrators.