Hi! I tried to come to the rescue regarding arms and forearms with an overpaint, being it super fast is not 100% perfect but i hope it helps! As for the stiffness, try to smooth the harsh curves, but i think you'll encounter the risk of going out of the design. Lastly, pay attention to values, cause in colors the palette you chose looks cool, but in b\w it looks too close! (and maybe is part of the why you perceive issues) Hope it helped even a little bit!











