Architects: always with pencil in hand taking the most important ideas of what they see.
How to analyze a terrain, what to take from it and what to consider for the design. Paper is my best friend, in fact, I try to represent everything graphically, so I never forget.
Sketchnote, it's a great technique. Look for it!
well, you could improve your drawing skills.
The photograph was taken at a few notes from my thesis tutor. Less is more!