Van Gogh's pen and ink drawings - Research Point

I chose Olive Trees, Montmajour (1888) to comment on. This is a really good example of the plentiful types of marks Van Gogh made using pen and ink. Stippling is used extensively over the drawing, mostly in the foreground, depicting the short grass/flowers. There is a lot of repetition - dots and lines. You can see lines making up the harvested fields in the far background. Fine lines and broad, dark lines also. There are parts completely filled in with black ink, and some areas left white and empty, where I assume are rocky areas of ground. The drawing is full of movement. You can see wind in the boughs of the trees and birds flying above.