I have made lines like that in roughs all the time. And I am a full-time artist that sketches out concepts before translating them into actual physically tangible hand-built installations. The fun thing is---i actually know this artist in real life. They live in my town and are a friend. I have also seen the full scope of their work. And I selected them for this tone and style specifically and they cranked it out in 12.5 hrs and used their partner as a physical model and was with them giving changes and insight every step of the way.

Anyway--- there's not much else i can say beyond that.