A high-finish head study on a toned canvas

     I almost always work on a toned ground.  A section of toned ground is showing in the lower right corner of this image.  My usual tone is a warm grey made by brushing on a thin wash of raw umber, sometimes with a touch of ivory black or ultramarine blue added.  Sometimes I let the canvas dry before painting, sometimes I work into the wet toned canvas.  It doesn't seem to matter to me.