So far I've done two trial runs on Arches #140 hotpress w/c paper. Wow, it's difficult to retain facial expressions and features while trying to duplicate skin tones, place shadows, etc. I also tried two different palettes and two separate styles. I'm now on to #90 coldpress to see what results I get on that substrate. I'm getting plenty of practice painting faces if nothing else. I'm going to feel like I know this woman personally by the time I'm done.