[trolololooo]

Very good answer. The botanical illustrator is taught how to demonstrate specific features of different taxonomies in a way that's natural and visually pleasing but conveys three dimensions of information, tactility, color, and biological characteristics (for example, do branches grow opposite one another or in a spiral up the stem, what is the texture under the leaf as well as above it, what does a bud look like, what does a live flower look like, what animals use this as a host plant and how, etc) that would be extremely difficult to photograph well.