These drawings by Liisa Kruusmägi are mixed media pieces that I really enjoy. There is a heavy emphasis on the face, with other lines simply indicating the body and clothing. It creates a nice push and pull of compositions. I think treating the whole piece with the same attention to detail would be overkill for the eye.
I personally love the stark, heavy line alone on paper. I am reminded of the work of Egon Schiele.
All images via her website.