Pen and wash can be used in many ways – from very finely drawn and precise lines to much wider and more irregular marks.
It all depends on your writing tool and your type of ink supply.
For this demo I chose a bamboo dipping pen and a pot of waterproof Winsor & Newton Black India Ink (951). I also used W&N Designers White Gouache for adding highlights. It was really exciting and unpredictable and got me out of my comfort zone.
If you click on the images they will take you to my YouTube video of me painting it.
These are very loose and exploratory studies that I did for my own interest but I hope they may prompt you to work on a favourite subject of your own.