Yeah, that's what I was trying to say. Usually, (actually 99.9% of the time) robots are portrayed as massive beasts of destruction, while yours remind me of when I was a kid, (a long time ago) when robots were still fresh and a source of wonderment for me.
Yup, the pre production booklet is due next week, Its about an actor who goes through a bit of a self worth crisis mid performance, the performance he gives is a bit lacklustre and insincere until he sees an empty chair in the centre of the theatre.
The fake him kind of fades away when he cant stop focusing on the empty chair and he gives a genuine performance which earns him an applause for actually baring himself emotionally...blah blah etc.
Who says it's a gun?! hmm? maybe it's a.....something else :/ Anyway, they're not that big really; none longer than 20cm. The white charcoal is like a pastel pencil so it can be sharpened to a point. Or fairly pointy... such as like what this here is [link] and the neatness is easy. You just paint the shape once and then drop in other colours while it's wet, instead of adding more strokes.
I have attempted this method in the past and... well. The edges weren't nearly as neat! It's a gorgeous effect though I must try again.
I hadn't thought about using a pastel pencil to add white on top of watercolour - which is madness considering I teach art and use white conte on top of everything. Sometimes the dots, they do not connect in my head...