I teach numerous Sketching for Scientists workshops each semester, for faculty, students, and science/science-allied professionals beyond academia. Each time I run these workshops, I share a list of the techniques we’ve discussed, as a memory aid. Here is that list, in case it's also helpful for you.
 
P.S. This is a free download I share as an open resource to support us all as we work to be better at drawing. You'll receive a link to the file after you complete your order. This will also subscribe you to my blog/newsletter/updates which happen *at most* weekly. You can unsubscribe any time, of course!