Glazing Shadows

Today I painted the grisaille, or grey scale, on top of my burnt umber underpainting. I simply use ivory black, titanium white, and my own medium comprised of 40% linseed oil/60% mineral spirits in varying amounts, depending on how dark or light I want each area to be. Basically it’s a glaze, as the amount of paint in the medium is very little, but it really adds shadow and volume to the forms.