As this piece progresses I will be adding thin layers of transparent paint over the monochrome underpainting.  This tinting gives an odd look at first.  I will have to add layers to reinforce extreme dark and light tones after the new paint dries.  It takes days for this paint to dry, which make this a slow painting technique.  This process allows me to deal with composition and value separately from color.  
This is one of the earliest methods of oil painting dating back to the Northern Renaissance greats.  Click the following links to see some examples of Jan van Eyck's underpainting and finished work.  Have fun zooming in on Google Art Project.  You can't get that close in a museum.

Stay tuned for future color corrections.

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