I think your imagination is too cartoonish
Idk maybe you're limited by what you can do on the texture because of the model but..
Thanos had a very muscular and detailed face in the movie I know this is wc3 model we're talking about but that doesn't mean it's face should look like as if it's drawn in paint.
This one right now misses so much detail. Lips, lines, a proper nose, eyes...that's why the look on his face is dull af.
Maybe someday if this model gets a custom skin by a skilled artist you will then understand what I'm talking about