It's good to use up bits of random illustration board and paper scraps instead of throwing them away. In fact, sometimes it even turns into something useful. Here are a few portraits I painted in oil, over top of some collage leftovers, and on oddly cut boards. One of my favourite things about oil paint is the ability to carve back into it before it dries. I find working outside of the box and the normal frame dimensions can add a new perspective or generate fresh ideas when least expected.