I have gotten back into pen and ink work again lately as I am contemplating doing another Lincoln portrait. (see others here, here and here.)
A beautiful gnarled tree I found in Bunker Hill Forest Preserve.
Noodlers #41 Brown ink with Esterbrook 788 nib in Strathmore Toned Tan sketchbook
Horse and Round Tailed Ground Squirrel from online references.
Noodlers #41 Brown ink with Esterbrook 788 nib on Rives tan paper