Jim your work is amazing and an inspiration. I need to work with more live models but I'm slowly grasping how much skill is needed to be at your level. The gesture, the shifting of weight, the pull of gravity, direction, shadows, bony landmarks, and skin folds and so much more! Man! You're so talented. All that not to mention your texturing which I presume takes up half of the whole process. Kudos!
If u want to sculpt small figurs, u want to use chavant, its expensive but does not dry out. When sculpting bigger ones, like the torso, u want to go for the water based, its far less expensive, but it drys out, so u need to constantly spray it down with water and cover it with plastic bags when u dont sculpt on it. If u water it down to much, it will also fall apart. Hope the info help u. Dont mind answering questions. Good luck