So I began making a point at night to draw some faces for her (which was my pleasure–faces are my favorite part, anyway). She would then pick up a pen with great focus, and begin to draw. Later, I would add color and highlights, texture and painting, to make a complete piece. Sometimes she filled in the solid areas with colored markers, but I would always finish with acrylics later on my own.
Image source and article: http://busymockingbird.com/2013/08/27/collaborating-with-a-4-year-old/