Water Bottle

I tried to sketch the water bottle with scribble lines as shown in Claudia Nice's "Drawing in Pen & Ink", but somehow my latest loose-line drawing took over. The lighting on the body was all diffused and I was all confused, so I left it blank.

I really like sketching styles; lines are not precise, but more lively, and sometimes they catch the essence better. On the other hand, in order to sketch better, I have to practice more on the regular drawing styles. This paradoxical principal seems to be universal; it's the same with Chinese brush calligraphy.

Media: technical pen.