Thank you David for such a comprehensive reply. Very informative and interesting! I'll try to do some tests holding the lantern closer to the subject's face and see how that works out. If I need to get more light I can look at the other options. I have a couple of small battery powered LEDs that I might be able to stick to the back and gel to get some more light.
Unfortunately this shoot is very last minute so they are my only real options other than using my dedo as a spot. If I was to use that would you front light and flag, similar to the screen grab above?
Thanks again, I truly appreciate it.