That was the note scribbled in pencil at the top of the drawing.
It struck me as sort of the ultimate fortune cookie: Was it imploring me to improve the machine part depicted that I was about to revise a drawing of? Or merely to improve on the illustration itself? My personal favorite way to interpret is as a request for the illustrator to improve himself.
I ended up improving on the illustration, reworking it so the steam and condensate pathways are more readily visible. But I have this nagging feeling that I should have left the illustration untouched and improved myself instead.
Don’t ya just hate vague instructions?