I remember the diagrams in Crafting Interpreters and thinking what a great application of hand-done diagrams it was. So glad you did them that way.

Also left handed, BTW. If you're ever interested in going it even more old-school -- dip pens with India or Sumi ink are the absolute bomb. The ink is blacker than anything I've seen except perhaps in intaglio/etchings -- it can be made darker than fountain pen ink because there is no fear of clogging. Yeah, there's a bit of cleanup after every use, but very satisfying too, for some use cases.