Smallish portraits

I have a small stack of 4x6 canvas boards and until recently, I was at a loss of what to do with them. Since I usually paint on a fairly large scale, I only have two uses for 4x6 surfaces;

1. Small preparatory studies - for color, value, composition and the like.
2. Practicing random approaches and experimentation.

The great thing about it of course, I don't have to prep any surface. So I get to unwrap the board and let loose. I'm trying to limit the studies to about an hour to help with strong decision making skills. I submit to you, the two that exist so far.