Nice gem on sketchnoting. Just followed.

I've done this more after I've developed a framework or model. Meaning I typically find myself creating diagrams that explain the thoughts I've developed after I've created a stream of thought (4-6 cards) explaining something.

Fiona McPherson has some good suggestions/tips in her book on Effective Notetaking. In general it revolves around using relevant icons for your illustrations and limiting your supporting text of the diagrams. (I.e. Have a good icon that explains the process and only 2-4 words paired with the icon).