Elemental warrior

This is an other personal project and concept which I did these days, and first approach with Zbrush, finally.
I have tried to do a game character, but I have had a lot of doubts about the poly count and edge loop, unfortunately the topics on forums haven't helped me so much so I think that I have done these things wrong.
Anyway one Elemental has 17k tris and uses 2 sets of textures, Metal/Rough PBR, one for the body and one for the crystal.
Criticisms are well welcome!