From my days supply teaching, but I was thinking about illustrations for Orwell's 1984.
The quick sketches of groups of pupils was a tool to quickly remember the thousands of names! (Names have been redacted). It was great to develop a shorthand of ten second drawings. Some of these have a nice flow, in the english tradition that is my natural way, of the heavenly triumvirate- Ardizzone, Peake and E.H.Shepard.
Also there are drawings by Wee Beefy, of the Derbyheed, and others.