Inactive Tutor answered 03/15/19
There are actually raised hand rests to prevent this problem when drawing.
Basically your drawing hand rests on the platform and you make your marks like that. Don't touch the paper till the ink is dry!
Here is one on Amazon:
https://www.amazon.com/Creative-Mark-Leaning-Painting-Sketching/dp/B0059558WG/ref=sr_1_25_sspa?keywords=drawing+rests&qid=1552616681&s=gateway&sr=8-25-spons&psc=1