Rough preliminary sketch, 'Giant dragon running across Gapstow Bridge'; hijacked photograph: 'The White Night', by Adolf Fassbender, 1936.
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This is the rough sketch I used for this, no clean-up, I just added lights and shading to the dragon a little to get a nice preview.
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Below: original art/photo by Adolf Fassbender, © Estate Adolf Fassbender, Fassbender Foundation. All rights reserved.