The two drawings above are charcoal on 18" x 24" paper. All of the poses were approximately 25 minutes long. I took flack from my husband for not even suggesting the face of the lower one. Besides myself, he's my toughest critic. It's ok though, because it keeps me improving. His life drawings are to die for when he gets time infront of a figure (and actually uses real media and not a computer).
The two drawings below are done using Derwent Watercolour pencils (Burnt Umber or VanDyke Brown, which I bought individually, not in a huge kit as the link suggests) in my sketchbook (a moleskine) which is approximately 9.75" x 7.5". Water will hopefully never touch these pages as the paper is too thin to handle such abuse. However, I like the idea and may experiment with some gestures on heavier paper with these and add water.
I really love the last pose. It expresses so much emotion. I think I will try to investigate this pose again soon (and for a longer period of time). I also like in this last drawing how much your eye fills in on its own. Economy of lines is working well in this one (in my humble opinion).