I am laying out the image on the canvas panel with a thinned
mix of brown made from umbers, almost a sepia tone. Wiping out and editing the
lines as I go, attempting to get as accurate a drawing as I can. What I want is
the basic structure and design over which I will lay my first color pass.
You can find more information and demos on underpainting
techniques here.
Links:
Grisaille underpainting
Explore - Question - Learn - Enjoy, Jim
Website - jimserrett.com
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Landscape Blog - Pochade Box Paintings