-Very long, curly eyelashes.
-Gold-colored cat eyes.

-They glow in the dark.

(Inner look)
-2 good-luck piercings.

As an interesting note, the name in this concept art is not “鉄獣戦線 凶鳥のシュライグ” (Tribrigade Shrike the Wicked Wings), but “鉄獣戦線 片翼のシュライグ” (Tribrigade Shrike the One-Winged, replacing “凶鳥”, wicked bird, for “片翼”, one-winged)

-Rough sketch for the Tribrigade mark/emblem. -> Simplified form.
-The mark/emblem is attached to their clothes or otherwise.

Mask.

-The commander, heading the army.
-Has a pet mecha-shrike.

(Back)

(Inner look)

Source.