These bits of coral took me a while to draw. And a whole mile of patience. I wonder how people draw these in such a way that suggests detail but without actually drawing it all out? If you think about Monet, he was able to capture the richness of a garden with not much detail. He used colour that was so suggestive of detail.
On the other end of the continuum is botanical drawing. I remember doing a five day workshop and the accuracy it required, drove me to distraction by the third day! Still, for the world of science, labelling and plant identification what a wonderful skill to have.