jezail을 대략 검색해 보니, 아프가니스탄 식의 장총...이라고 나오는 것 같은데 그럼 저 인물도 그 지방 출신인가요?

예, 저번에 블로그에 올린 바대로, 아프가니스탄/발루치스탄/신드 지역 병사들의 기록화를 보고 그린 그림입니다.

How was one to shoot and aim with such a musket?

Alas, I don’t know exactly. Some suspect that the curve of the stock was tucked under arm when shooting, though that’s unlikely considering that such posture would put the firing pan too close to shooter's eyes. They usually had foldable bipod made of horns or metal attached to the barrel(which I forgot to depict in this doodle), so I think they could be fired without problem in protected, stationary position.

Judging from that stock, it looks as if it was meant to be butted against the chest... 7@=e

aj a fine Jezzail there.

https://www.youtube.com/watch?v=i9bm0K17WcU

Wonderful sketch!