DON'T JUST SIT THERE!
I come from a household where corrective, encouraging, commands were heard on an ongoing basis. Like, "Sit up straight", "Ain't isn't a word", "Slow down and chew your food" etc. Ongoing encouragement like this actually shaped my life and had significant positive impact in the overall ability for Bob, to interact with society. This isn't exact science, but my guess is that at least 75% of the unwanted lines in our drawing come from trying to draw against the way our body is