More gold on the chest would be good.
Anyway, for an arm design I recommend using the Gold skull spider mask as the shoulders. (if you don’t have 2 you should buy one on bricklink) besides that, I don’t know.
Just a quick update. I have the arm design, which is good. I have also bulked up the knees and eliminated the major gaps in the torso. No photos as this guy is very close to being finished and I don’t want to spoil his final look. I haven’t found a way to include any gold on the torso, but it doesn’t bother me.