Sources for drawings
A diagram of sources for drawings from the viewpoint of an artist.
Inspiration and references may come from nature, from other images or from the artist's own memory.
Other images may be based on nature.
Memories may be based on other images or nature.
A drawing is a physical or digital object made with tools.
Meaning is created through discourse about the object.
Discourse takes into account tools, sources and provenance.
The current state of the drawing itself may be a source as well, but those states might count as images.