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After scanning, I strengthen the contrast of my pencil sketch by using Auto Levels sometimes with an additional Levels nudge to further darken the blacks, and then I use Threshold to convert the pixels to either black or white. Making sure the Magic Wand's Contiguous and Anti-alias options are off, and Interpolation is set to Nearest Neighbor, I select and delete all of the white pixels and then begin to move things around. If I get one version I like, I flatten the image, copy it, undo the flattening, and then paste the copied version back into the file. Even though I've chosen Undo, the copied image stays in the Clipboard memory so I can paste it back in.
The top two sketches are getting a bit closer a good likeness. Tommy Thompson has a swoop nose (actually kind of like Nixon's) and heavy eyebrows that almost looked dyed black sometimes. His neck is fairly heavy with abundant wrinkles. These are the features I'm focusing on to get the likeness.
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