White pastel pencils are good for highlights and teeth....just don't put charcoal within the object you want to whiten....another way is to upload the image and increase the contrast and doodle with digital brushes to whiten things....when I say I have done a "digital polish" on my drawings, that's what I'm talking about. When I went to art school the teachers in advanced drawing class would berate me for using my fingertips to smudge things....but I had been doing that all my life for blending graphite. What's the old saying? "THOSE THAT CAN, DO....THOSE THAT CAN'T, TEACH.
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