Glazing

The color is added slowly.  It takes a long time to build up all the layers, but it definitely adds a depth and detail that can't be achieved otherwise.  The pic above is two or three layers of glazed color.  I glaze with straight liquin as the medium, usually.  
You can see some differences in this pic from the previous.  This is about two additional layers worth.  Each layer takes about 48 hours to dry.  Like I said, it takes a long time.  A great glazing trick is to wipe the entire panel with a very thin layer of cold pressed linseed oil prior to painting.

More color to come...