I really enjoyed this lesson. I can absolutely see how regularly practicing like this could lead to interesting new drawings and ideas.
This exercise was quite a meditative experience. I just threw on some records and rewatched Mr. Zapata's video on mute. As the video played, I alternated between trying to follow exactly what Mr. Zapata was drawing, the general trend or pattern type he was drawing, and doing my own thing altogether.
Liked your "Creating Textures" lesson, never had it explained like that before. Good Job. Think the Coral you were talking about are Urchins, would see them in the tide pools when surfing. That is what I saw in your hatchwork anyway. I do like this, using textures as contures to show form along with light and shadow. Cool.