Oil on unprotected paper is that great modern art class no-no, because it's not archival and will rot the paper eventually, perhaps 200 years from now. This is school of thought Number 1. School Number 2 says, screw it. If your work is deemed important to preserve, it will be preserved. No one is going to let Picassos rot away, or even Klines.
So here's oil on collage, though I covered the collage with a cheating coat of gloss medium to make a nice slippery surface. I wanted to be able to move the paint around with brush and fingers yet have it sit above the surface, letting the phone book show through.

I tried to work some white in, but it still seems too white to me, but it's time to move on. I might knock it back a bit later, adding a little ochre or umber. And all my moving of stuff around did matte and dirty the surface a bit, but I can live with it. I felt a bit tentative doing all this, for some reason, maybe because I really liked the collage underneath. Next one I promise will be bold.