Storyboard
I have always found storyboarding the most fun during any production because I find it easier to communicate a story instead of a written narrative and it does not have to be perfect. I believe I usually go into too much detail when it comes to storyboarding which can take a while sometimes so I believe that after doing quick observational drawings really helped me with drawing quicker as I had to be speedy to draw people as I can not predict their next actions.
Observation and location al drawing: