Backpack Contour Drawing

I thought this exercise was very fun! I really liked trying to draw all the creases and folds in the material of my backpack. This expanded my artistic comfort zone a lot because I usually attempt drawings like this with a pencil, so I can add shading and I can erase where I mess up. Using pen, and one continuous line was definitely hard but I think it helped me improve as an artist. I think my drawing turned out very well.