Drawn by desire
I recently read The English Patient by Michael Ondaatje, in it there is a mention of a map signed by the cartographer who added "drawn by desire of Lord Suffolk".
I love that phrase and scribbled it in my sketchbook, it's top right of a page of sketches done while in Scotland. I added "so much better than commissioned by" - and it is!
The sketches are a mixture of on the spot observations of the estuary at Cardoness, and quick scribblings done from photos - just referencing what I could see in the panel on my camera - on a rainy day in Kirkcudbright.