Why he just can´t kill something intelectual and big, and take his badass mace?
Certainly, but I suggest that it can be a more versatile model if it retains the concept of the Mountain Giant.
The mace it is wielding conceptually belongs to species of different genre of craftmanship, representing and reflecting their very culture, for instance: Dwarves, Humans, perhaps the Undead. That is the reason why I refered to contrasting effects.
Allow me to be practical:
Longer time ago, I was looking for a model that would represent Giants in Northrend. I found this model of yours and my demand was indeed greatly satisfied.
However, as resembling to lumbering brutes that simply wander or reside in the barren corners of Northrend with a highest expression of their artristic skills (demonstrating limited intelect in savagery) in decoration of themselves with objects of straightforward meaning (bone decorations = I am deadly) of natural origin, a capacity to elaborate a such device as is the mace provided contradicts this concept and the very idea.
Some may justify the idea by stating, that he may found the weapon, however, that concept should be reserved for the individualistic model. If this model is to be used in numbers, this will cause a conceptual conflict.
From my position: In order to make this model more useful or usable, I suggest at least incorporation of the more neutral fighting capacities, as used in the case of Mountain Giant. Additionally, this should provide an universal basis for a further model developement (attachments and other individual modifications), but mostly a more universal model, if the author meant it to be so.
To be redeeming: I state this because I deeply appreciate this model and would like to see it processed to its full potential.
Addendum: "This also applies to the thing on the back of the creature."