Wow, Zweit that's really cool. It's helpfull to me at least!
(The demon looks like from the Demon's Crest SNES game .^^
For your gestures: It helps me usually to sketch in the ribcage (approximately, at least. ;P) and some circles for the hips. The space in between is easier to determine then, if that makes sense. Also I get a better idea of the 3 dimensionality and how the body contour changes when the torso turns, for example.