That green guy is very interesting 
just a couple comments on the design.
Something that I’ve been told about some of my stuff on several occasions, and that has helped me a lot, was that the back was letting down the bulk of the rest of character, and I would say that a bit of that is going on here.
I would say it’s within reason to bulk up his back, looking at the rear view, in order to support those huge arms. Those Lats look pretty big in profile, but doesn’t read that way laterally, imo. Tapering down to the waist is fine, but I think widening out that upper back into the shoulders would help sell his ability to wail on someone 
Those quad horns would make it difficult for any major leg abduction, but that’s neither here nor there lol.
Cool stuff. keep it up.