Using small sketchbooks

Now I find that carrying a small sketchbook is paying off, particularly outdoors.
I need to look at the sketchbooks of artists now. Inspired to see that Henry Moore sketched the sheep in the field outside his studio. I have lots of sheep outside the window so that's a start.
I have struggled to sketch some local trees and have botched the effect but then I realised that it was the early morning shadows with the trees that say more.