I'm genuinely impressed with your sketch! Did you do this on the fly or did you wait until afterwards? Anytime I've tried doing sketches it takes me a long time and I miss what the speaker is talking about.
It was my first time doing a sketchnote, so I had no idea what I was doing. I did it in 2 passes - rough draft during the keynote, and a second one to clean it up and make it more legible. It worked, but I learned a lot about how to do it better - if I'd planned ahead better, it would have been easier.
Here's a video with each stroke recorded, if you want to see what the process looked like. Procreate on iPad is amazing. Layers, great ink, and lots of types of sketching/drawing/painting.