Your screenshot isn't working, bit I think I can answer you question. The classic Black Mage look of an obscure face and glowing eyes was more of a stylistic choice in the original Final Fantasy; because of the hats they wore. In the original when the job was upgraded to Black Wizard, the hat was removed and it showed a normal face. Over time though the look became iconic for an obscured face and even created the memorable character of Vivi.
Now as for what you saw. In the Shadowbringers expansion, a new beast tribe was introduced, the Dwarves, that are based on the Dwarves from Final Fantasy IV, who had obscured faces like a Black Mage. Dwarved gear is obtainable/craftable around level 78-79. The head pieces are designed to mimic the obscured face combo that the Dwarves of FFIV had.
Not sure how far you are in the overall story, but if you are curious about the Dwarves at all here is the answer.
Dwarves are actually just Lalafell from another world