looks pretty good! some small things:
-arm with shield looks shorter than arm with sword (maybe is bent, but then it's bent all the time?)
-the ribs don't read like they're getting closer together when the skeleton leans in/breathes out. maybe use the dark bone shade for the ribs there instead of the shadow color?
-you also lose the impression that the shoulder pad is ridged since a lot of the dots disappear.
Oh well, I'm looking now at his right arm, you'r right it's shorter than the left one.
I'll try something out for those ribs, but I think it's ok, I don't know what are you trying to mean exactly.
Thanks a lot for replying.