The artists have prepared a whole bunch of options for Odin.
Studio Sony Santa Monica and its contractors have released many concept art created during the development of God of War Ragnarok. We have concepts for key characters and plot points, images of locations and many fantastical creatures.
Judging by the concepts, the developers could not decide on the appearance of Odin for the longest time: a lot of art is dedicated to this character, a lot of different images were offered for Odin.
In addition, the artists quite actively experimented with the appearance of Surt and some other heroes. And the grown-up Atreus, it seems, was invented quite quickly.
Characters
Locations
key scenes
Creatures and monsters
See even more God of War Ragnarok concept art here.
This is interesting