I used a picture of a piano to draw an outline, and then shaded it in with a single thread. I was going for a sort of sketchy cross-hatching effect.
![Avatar](https://cdn.statically.io/img/i.pinimg.com/140x140_RS/c8/88/1e/c8881e7a72960668750891b4cbc6854a.jpg)
Kinha Chagas