A Dead Oak Tree, Carl Wihelm Kolbe
Etching on laid paper, roughly 14 x 20 inches (37 x 52 cm),
Link is to zoomable version on Google Art Project; original is in the collection of the National Gallery of Art, DC, which has a downloadable high-res version of the image.
Kolbe was noted for his intricately detailed portrayals of natural forms, both real and fantastical. What I admire most about this drawing (an etching is essentially a drawing), is the wonderful control of value.
Kolbe has used hatching and stipple to render the foreground form with visceral texture and contrast, but is still able to give the background elements a similar feeling of tactile detail while pushing them back with atmospheric perspective.