Lose them BS proportions currently they are blizzard-tier. Enhance the design by making him look more like a warrior and less like an homoerotic laser-disco mecha by removing all the glowing crystals.
Instead provide his helmet with slits so he can do useful combat tasks like for example see things and breathe.
Lose the nuclear lolipop typ device and give him a dangerous looking weapon like a sharp axe of a size that make it look actually usefull as a weapon.
Isolate him from the background and improve the depth of the render by deepening occlusion type shadows on his armor and provide some rimlights.
Also work on the contrast of the whole render.
I would tweak the pose some too, but at least correct that foot penetrating the floor.
I suggest tilting the camera, the dramatic lean seems a bit too much. Basically De-Blizz the whole image.