right arm/hand seems to work well. you appear to have already taken care of this: in a normal human hand, all the finger joints of a digit bend in a similar amount during active bending, dependent with each other. you may have also considered such details as no hand twisting, no finger twisting and limiting finger side-to-side motions to joint 1. of course, in simpler software like poser, such actions are allowed, and there are even some completely non-human motions allowed, e.g. "offset", a sort of sideways dislocation of the fingers in the plane of the hand.