Critique on your interpretation; primal to me is big, raw, powerful, simple.
Looks to me like you are over complicating the clothing, and making the figure look like it has no muscle.
Simplify everything, add layers, add bulk, keep the lighting raw and try to get the pure power across. The pose is a bit static aswell, would be nice to get some kind of movment happening, some flow in the robes, some smoke or something from his hands.
My idea would be more along the lines of a hulking man cloaked in layers of black robes and feathered capes and stripes. Beaks and claws hanging from sashes and belts, in one barrel of a fist a short staff in the shape of a twisted crows claw, various trophies and decorations hanging from it, in his other hand pure power glows as smoke hangs and blows around in thick strands. On his bare shoulders, arms and face black tribal tattoos. His burning eyes glow like hot coals, and smoke similarly.
I certainly wouldn't imagine some stickman hunched over hurling around a small glowying orb with his spikey over-starches robes.
That's just my opinion
The actual art is nice as usual, not exactly spectacular but yet more proof that you are well on the way to mastering the concept art style ;)