Chimpanzee - Pen Drawing

Hi all,
Happy Sunday!

Here is my new pen drawing from my animal series.
It's been a while I drew a Chimpanzee. I think I should look into drawing them more often. They are really fun to draw - especially those their expressions and the rigorous strokes moving around their faces to build forms.

Here, I sketched a young chimpanzee with a calm looking face. I think a lot of thoughts is running through his mind right now.

The drawing was done with a blue ballpoint pen on a cardboard paper using scribble style. You can see my steps below:

Thank you.