This is a really good MoC! The colours flow very nicely and the build is very good. However, I feel that the black on the lower leg in a bit unnecessary, and kind of breaks the colour scheme, but not to the point of ruining it entirely. Over all, I give this MoC a 10/10!
What I would do is use one of those golden shoulder armour pieces from Ekimu (you used them on your MoC’s shoulders) and attach them pin to axel hole and have the Luther pin resting in the hole of the socket. I know it sounds confusing.