The Crow Quill makes the thinnest lines I know of outside of a Rapidograph. It has a scratchy feel and allows great accuracy. I use the Crow Quill when I want to do a Rembrandt-esque drawing. However, because of the fineness of Crow Quill lines, this pen is really only suitable for smaller drawings; there are more efficient ways of doing a large drawing than with a Crow Quill. Once you’re finished inking, do a wash to add dimension to your drawing.