he has em on the knees and elbows not sure about the hips, shoulders, ancle and hand. Its an easy fix, just have one row of polys like that 2nd one in the pic dynamic` posted.
The hands,ancle,shoulders,hips need to move to more than one direction unlike the knee and elbow so you gotta have 1 row so when it turns the other direction it can atleast stretch... If that made any sense.. Anywho the shoulders still look weird to me but knowing your drawing skills i know ur prolly correct on this ;p
Keep it up! =)