This video is simple and poor video quality, but it gets the idea across. I will expect higher quality and better drawings from whomever I hire.
https://www.youtube.com/watch? ... You need to have a high quality camera that can shoot HD video and a way to secure the camera above you so you can see the entire sketch.
You need to be able to draw sketches of people, pets, cars, car accidents, hospitals, basic hospital equipment, smart phone, etc.