Rule 34 Dev - 1boy bird black_hair closed_mouth eren_kruger facial_mark formal_clothes grey_background greyscale hat highres jacket male_focus military military_uniform monochrome name_connection necktie owl scar scar_on_face shingeki_no_kyojin short_hair signature simple_background solo suit unworn_hat unworn_headwear vvv020vvv|11429865720