Excellent sketch. Crater Plato, I'm pretty sure. Love those spiky shadows on the crater floor.
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In the meantime, what does everyone spray on their sketches to keep the dust from smearing?
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I reduce the darkening you saw by doing two things:
- I put the pastel on really thick! Yes, it's messy.
- I use Boyle "Matt Spray Finishing Sealer" which is an aerosol. I spray it on in about 5 very light coats, allowing to dry for 5 mins or so in between coats.
-Ivan