Ink and Watercolor sketch of octopus. Normally I start with a pencil outline, then go over it with micron pens. But I'm learning to skip the pencil step and just sketch with ink. I helps you not to overthink things. Once you lay the ink line down on the paper it's there to stay. You can't erase and there isn't an undo like you have when working digitally. You just have to work around any "mistakes" you make. I'm also working on sketching faster because I just don't have that much free time these days. Trying to produce a new sketch every day is a real challenge.
I was fortunate enough to to take my sketchbook class to observe medical students dissect donor cadavers. These donors gave there bodies to science to further our knowledge of the human anatomy and to train our future doctors. We worked alongside the med students and anatomy fellows. It was a humbling and fascinating experience.