I'm still going to argue that adding just a few more bones will help immensely! The meshes are already dense enough. Some refinements to grouping and boning can make a visual difference... as in the difference between regular action figures and superposeable action figures. As an example, look at Jame's knee and butt: If the knee had 2 bending points, it could accomodate the type of bending that real knees do (think of Japanese monks sitting between their feet). With a buttocks group, a leg which is going back ought to be able to morph to indicate the clenched muscles.