Film is easier with a still image .Theatrical production is all look in one direction and the light is pointing towards the stage.
The reading part of the ACT Aspire is 60 mins along. Good luck on the ACT!
Answer:
The easiest thing to do in you situation would be to use references from other drawings or real pictures, and make sure you use a consistent light source. Sorry if this doesn't answer you question but these are some tips.
